A book unlike anything you've ever read before

The Book That Will Return Love to Humanity

Three times best-seller. 40,000+ books sold worldwide. A revolutionary reading experience that will change how you see yourself and others.

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3 Years Bestseller award#1 Bestseller award40,000+ Copies Sold award

★ For 3 consecutive years, the #1 best-selling book in its country of origin.

The Book That Will Return
Loved by 40,000+ readers worldwide
[psi] explains why we think and act the way we do, making it easier to improve ourselves and our relationships. A thought-provoking read! — Silvia Arce Akkus [psi] is one of the most insightful books I've read on self-improvement. It dives into the psychology behind our thoughts, behaviors, and emotions with practical strategies. — taja_karner This book completely changed the way I see myself and others. Unlike many self-help books that focus on surface-level positivity, [psi] goes deeper. — Jan Desair [psi] is a unique blend of psychology and personal growth. It goes beyond clichés and provides real strategies for improving decision-making and finding balance. — Tanja Fajon This book provides such an enlightening and profound translation of life, and of people. I learn something new and meaningful every time I pick it up. — Nina Beljakovic [psi] is a great book! Very different from any book I've read before. — Dejan Zavec

Real People, Real Experiences

Video Testimonials

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Verified Reviews

Join our community, start accepting reality and find happiness

4.38 on Goodreads · 413 ratings · Rated Excellent

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4.38 / 5 413+ ratings on Goodreads
40,000+
Copies sold worldwide
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Video testimonials

Two sides of the same coin

Love is the most beautiful thing that can ever happen to you

And yet love alone holds a power nothing else does — the power to fill you to the brim, and the power to break you to the bone.

The beauty of love

When you truly love, every day is brighter and every heartbeat carries meaning. Love reveals who you really are — and who you can become. Nothing in the world compares to the feeling of loving and being loved.

The pain of a breakup

But if you truly loved someone, a breakup is worse than the death of a loved one. Death is final — a breakup stays alive. The person breathes, walks, exists — just not for you. It is a wound time alone does not heal.

“Whoever has never truly loved knows neither the greatest joy nor the deepest pain — and therefore does not know themselves.”

[psi] teaches you how to recognise true love, how to keep it — and how to survive losing it.

Readers around the world

Real faces, real stories

Readers who picked up [psi] — and couldn't put it down.

[psi] reader — Nina Beljakovic

This book offers such an enlightening and profound translation of life and people. Every time I pick it up, I learn something new and important and gain so much wisdom from reading it.

Nina Beljakovic
[psi] reader — taja_karner

[psi] is one of the most insightful self-development books I've ever read. It reveals the psychology behind our thoughts, behaviors and emotions. It helps you uncover hidden layers of the psyche and at the same time offers practical strategies for overcoming fear, making better decisions and balancing emotions. The part about understanding the psyche of others spoke to me especially — it made a huge difference in my relationships. If you're looking for a book that combines deep psychological insight with real solutions, this is the one.

taja_karner
[psi] reader — Dejan Zavec

[psi] is an excellent book! Completely different from anything I've read before.

Dejan Zavec
[psi] reader — Jan Desair

This book completely changed the way I see myself and others. Unlike many self-help books that stay on surface positivity, [psi] goes deeper — into the psychology of personal growth. It pushes you to reflect on your thought patterns and emotional triggers, while giving you clear, structured steps for lasting change.

Jan Desair
[psi] reader — Silvia Arce Akkus

[psi] explains why we think and behave the way we do — making it easier to improve ourselves and our relationships with others. A book that truly wakes you up.

Silvia Arce Akkus
[psi] reader — Tanja Fajon

[psi] is a unique blend of psychology and personal growth. It goes beyond clichés and offers real strategies for better decisions, overcoming fear, and finding inner balance.

Tanja Fajon

Seven Proofs

Will you be the one to reveal the seventh proof?

Six secrets have been solved. The seventh remains hidden.

It is written that this book was not created by the human mind. Within it are hidden seven revelations — seven unimagined answers to seven of humanity's greatest unsolved questions, from completely different fields. Mere coincidence?

Proof 1

Psychological Proof

Three minds, one human

Three minds, one human.

The first proof is the revelation of REI — the psychological model of the three minds that make up every human being. This knowledge was once known to humanity, but it had been lost.

Linked to the seventh proof

Proof 2

Musical Proof

Bach's Passacaglia and a 293-year-old secret

Bach's Passacaglia and a 293-year-old secret.

The second revelation of Life is recorded in the third world and is perhaps the most vivid of all the proofs, for it is given in the form of a solution — a solution to one of the greatest secrets of classical music. Thousands of musicians and music historians around the world have wrestled with it, yet in 293 years since its creation no one has been able to unravel it.

The secret is bound to the musical genius of Johann Sebastian Bach and his masterpiece, the Passacaglia in C minor, BWV 582. It is well known that Bach often hid messages within his works, encoded directly into the notation.

In 1717 the celebrated French composer Louis Marchand was visiting Dresden. Bach challenged him to a musical duel. On the eve of the duel, Marchand is said to have come secretly to listen to Bach play — and realising that the next day he could only be humiliated, he left Dresden in the night.

The peculiarity of Bach's Passacaglia is the seven-note melody in the second part of the bass. It is here that Bach hid a message, read backwards: "Lo. Marchand – Hannes." Hannes was at that time a mocking name for someone acting recklessly (John the Baptist — Johannes — was beheaded).

The probability of coincidence is 2 × 10⁻¹³. The hidden code is mathematically perfect, leaving nothing to free interpretation.

Proof 3

Mathematical Proof

Time as the fundamental dimension of the point

The missing fundamental — time as a dimension of the point.

The very fact that something exists is enough to claim that it could exist infinitely many times. The claim is, in essence, only a question of dimension.

Mathematics textbooks describe the point as one of the fundamental concepts — an infinitely small element of space without dimension. But this is not true. Even the point cannot exist without a fourth dimension: time.

If one point exists, then more points can exist. But because the point has no spatial dimensions, all of them would overlap. To have two points, we need the first dimension. To have two lines, the second. For more planes, the third. And for more infinite spaces — the fourth dimension: time.

Every point therefore defines time. The point represents time (t). This long-missing fundamental of mathematics is connected to the seventh proof.

Linked to the seventh proof

Proof 4

Geological Proof

The mechanism that moves the seven plates

A new mechanism for the seven continental plates.

Earth is a living planet. The theory of plate tectonics explains that the Earth's crust is made of seven major and several minor lithospheric plates floating on the asthenosphere. One of the greatest unsolved questions remains the mechanism by which these plates move.

In the fourth world, Life reveals an entirely new theory that explains this mechanism in a brilliant yet simple way.

The Moon is constantly drifting away from Earth, breaking the balance between the rotation of the planets and causing Earth's axis to shift. The shift in the axis pulls the equator with it, and consequently changes the shape of the geoid.

At present the axis is creeping at the north pole towards Europe, at the south pole towards the Pacific. North Africa is therefore sinking and sliding under the Eurasian plate, while South Africa is rising. The Coriolis force is steadily reshaping the Earth.

Linked to the seventh proof

Proof 5

Anthropological Proof

The causes of obesity and seven rules

Seven simple rules for the body Life intended for you.

In the sixth world, Life reveals the causes of obesity. Only those who fully accept themselves can truly love — and dissatisfaction with one's appearance is the foremost reason for not accepting oneself.

The human body is the product of millions of years of evolution and still reads the signs of nature as it once did. A lack of water warns of drought, hunger of food shortage. Modern nutrition constantly tells the body that winter is coming — and so the body never stops storing reserves.

Seven simple rules: begin the day with plain water; sort food into three groups (foods of animal origin, spring–summer greens, and fruits of late summer); combine foods of animal origin only with spring–summer greens; wait at least 3 hours after animal-origin foods before eating fruits of late summer; wait at least 2 hours after fruits of late summer before eating animal-origin foods; eat often and do not restrict quantity; add some physical activity.

This proof is not directly linked to the seventh, yet it warns of an ignorance responsible for the second-greatest problem of modern man.

Proof 6

Historical Proof

The Three Wise Men — the missing link

The Three Wise Men — a wholly new meaning.

The sixth proof connects the first proof to our past. It is bound to the story of the Three Wise Men, which acquires an entirely new meaning with the final revelation.

The three wise men followed a star, as foretold. In the oldest sources they approached the manger separately, without gifts. The youngest, Melgon (Melchior), declared the new king bore his character. The middle, Jasper (Caspar), claimed the same. And the elder, Bal-shur-uzur (Balthazar), as well.

Unable to agree, they brought three gifts: frankincense, gold, and myrrh. The new king, without hesitation, chose all three.

The names of the wise men reveal the truth: Melgon = "my king is light" (Emocio). Jasper = "the royal treasurer" (Racio). Bal-shur-uzur = "Bal protects the king" (Instinct). The three wise men are a symbolic representation of the three minds.

The new king thanked them with an ordinary stone — worth more than all their gifts. The wise men did not understand and threw it into a well. And so all of humanity lost love.

Linked to the seventh proof

Proof 7

The Seventh Proof

The thirteenth character. Three paths. One truth.

The thirteenth character. Three paths. A €10,000+ reward and co-ownership of the book.

The seventh proof of Life surpasses all the others in every respect, and is meant for the last doubters. The author discovered it within his own work by chance, after the book was already finished.

The seventh proof also conceals an extraordinary reward: the 7th copy of this book — worth more than €10,000 — and co-ownership of the book itself.

The seventh proof was revealed to the author through an improbable coincidence — behind which lies the plan of Life itself, a plan that will change the way [psi] is seen even by those whose minds cannot grasp the truth of what is written.

This secret has never been spoken and never been written. It will be revealed to humanity by a person of the thirteenth character, chosen at random by Life.

Three paths lead to the seventh proof — one for each mind. But only the one who manages to recognize all three paths at once will see the truth. That one will be the thirteenth.

Still unrevealed

Three paths lead to the seventh proof — one for each mind. Only the one who recognizes all three will see the truth.

Explore all seven proofs

4.8 out of 5 based on 86 reviews

May 24, 2026

After reading [psi]

After reading [psi], you begin to see life in a completely new light. It opens up a different perspective and invites you to truly surrender to life and allow it to guide you. It is one of the rare books I will gladly return to many times, because each reading reveals something new, as if the book changes and grows together with you. It's a story that doesn't speak to you only through its plot, but through the depth it awakens within you.

Klementina Makari Verified Buyer

May 22, 2026

Worth reading

I had come across the book [psi] many times over the years, but before reading it, I wasn't completely sure whether I would really like it. However, once I finally picked it up, my opinion quickly changed. Right from the beginning, I liked the "instructions" for reading, as they introduce the reader to the story in a unique way. The chapters flow nicely and are different from one to another, making the reading experience very pleasant and smooth.

barbara pejovnik Verified Buyer

May 17, 2026

Exceptional Value — Highly Recommend!

I've been using PSI Books for a while now and I genuinely can't fault them. The quality of the books is outstanding, and the pricing offers incredible value for money compared to anywhere else I've looked. Every order has been exactly what I expected — and then some. Whether you're a casual reader or a serious book lover, PSI Books delivers on every front.

Tashus_cafe Verified Buyer

May 10, 2026

Amazing book

Amazing book, I've got many revelations during this book. I love it and I will read it again.

Alexandru Batalan Verified Buyer

Mar 13, 2026

The infinite depth of human thought

It is a book that definitely makes you see life differently. Each chapter brings new insights and new questions. A book that presents human psychology in a unique way.

Darko Verified Buyer

Feb 23, 2026

Life changing book

Not similar to anything I had read before. It totally changed my life.

Eleanna Papakosta Verified Buyer

Feb 18, 2026

I have read the book over 20 times

I have read the book over 20 times because it is an inexhaustible source of new knowledge and a much better understanding of ourselves, the world around us and the people we meet in it. A unique explanation of falling in love and love that you have not read anywhere else.

Erik Miletić Verified Buyer

Feb 18, 2026

Psi is not a book you simply read

Psi is not a book you simply read – it reads you. It is like a mirror you don't hold in your hands, but within yourself. Through symbolism, the worlds of the psyche, and the quiet wisdom of the three minds, it reveals the patterns that silently shape your life and invites you to the place where science and mystery meet.

Natalija Zlebak Verified Buyer

Feb 11, 2026

Profound insights into the human psyche

The story talks about Eros, a young man who runs away from home because of being disappointed in love. He then meets a talking dog, a metaphor for Life. Eros' journey becomes an in-depth exploration of your own mind, your thoughts, actions, and feelings. One of the most profound stories I've ever read that will change how you understand yourself and the people you meet, love, and care about.

Alberto Tupputi Verified Buyer

Jan 18, 2026

PSI book — a masterpiece

The worlds and characters in the book did not feel external, they felt like different parts of my world and myself. PSI flicked a switch inside me. Insights arrived suddenly and with clarity. This is not a book you simply read: it is a book you experience. It is transformative, confronting and profoundly illuminating.

Gertrude Spiteri Verified Buyer

Feb 16, 2026

Ein besonderes Erlebnis

Das Lesen des Buches war ein besonderes Erlebnis. Auf alle Fälle werde ich es noch einmal lesen. Es gab viel Anstoss zum Nachdenken. Es ist in seiner Form auch sehr besonders. Einfach ein kleines Kunstwerk. Super schön!

Leonie Mareia Verified Buyer

Oct 5, 2025

Unlike anything you or I may ever read

After receiving and opening this beautiful looking book, I read the instructions, ok I thought. As I read the opening pages, as an author I noticed, no foreword, introduction, nothing. I knew this was going to be special, it didn't disappoint. Through each and every story, we were there. It changes you for the better and I'm on my 2nd read through. Thank you Eros.

Eric McCann Verified Buyer
Read all 86 reviews on Trustpilot

More than just a book

Discover the experience that has moved thousands of readers around the world.
World Explanations

Twelve worlds of the book — unlocked only for readers

Each world holds explanations and keys, accessible only to those who have read the book. Six worlds have already been revealed; the rest will be unveiled gradually.

Introduction IntroductionThe gateway to all worlds
World 1 First WorldThe garden of secrets World 2 Second WorldThe three minds World 3 Third WorldThe empty pages World 4 Fourth WorldMechanism of the seven plates
World 5 Fifth WorldMusic and hidden signs World 6 Sixth WorldThe Three Wise Men World 7 Seventh WorldYet to be revealed World 8 Eighth WorldYet to be revealed
World 9 Ninth WorldYet to be revealed World 10 Tenth WorldYet to be revealed World 11 Eleventh WorldYet to be revealed World 12 Twelfth WorldYet to be revealed

Swipe to explore →

World 1 First WorldThe garden of secrets World 2 Second WorldThe three minds World 3 Third WorldThe empty pages World 4 Fourth WorldMechanism of the seven plates World 5 Fifth WorldMusic and hidden signs World 6 Sixth WorldThe Three Wise Men World 7 Seventh WorldYet to be revealed World 8 Eighth WorldYet to be revealed World 9 Ninth WorldYet to be revealed World 10 Tenth WorldYet to be revealed World 11 Eleventh WorldYet to be revealed World 12 Twelfth WorldYet to be revealed

Have the book? Unlock the first six worlds.

Unlock the world explanations

4.40 out of 5 based on 426 ratings & 117 reviews

July 10, 2015

Long forgotten knowledge, that changed my life. After you read it, it is wise to absorb it fully, by talking to friends who also read it. And most importantly, explore the topic further, by reading over 250+ blog articles written by the author himself.

Peter Premužič Goodreads Reader
April 20, 2015

This is the kind of book that you read over and over again for the rest of your life. And every time you read it, it's different from the other...

Kristina Goodreads Reader
October 2, 2024

The best book ever! If you want to know more about yourself and others and if you want answers about everithing ... this is the right book for you. Just open your mind and read [psi].

Andreja Kovačić Goodreads Reader
September 21, 2017

Deep, powerful & life changing.

Billy Drage Goodreads Reader
September 22, 2024

[Psi] Changed my Life. I cant explain how thankful i am to get this book many years before. Im reading it the 6th time. Every time i red it, my self acceptance was more. It is really a gift if you get it in your hands, take it :-).

Kristina Kuran Goodreads Reader
July 21, 2023

The book that found me when I was ready to accept the beauty of what it represents. It has made a strong impact on me.

Alen Spanjol Goodreads Reader
October 3, 2024

The more you read the book, the more the book reads you.

Romina Justinek Goodreads Reader
September 27, 2024

A unique book that skillfully guides us through the worlds of different people, each of them dealing with their own peculiarities and challenges. To me, the book is simply beautiful and special, and it made a strong impression on me. While reading, the book showed me how to look at life and other people differently. The changes are subtle at first but develop over time and are truly life-changing in the long run.

Tea Indest Goodreads Reader
May 29, 2025

The price was forgotten as soon as I felt the book. Thank you for putting in the effort and making the book to a high standard that will last for generations. It's a wonderful contrast to so many things in our society. This book will stay in my family for generations. It changed me in exciting ways. I look forward to reading this book again and experiencing a whole new adventure.

Quanita Goodreads Reader
November 6, 2024

The book opened up and changed my view of life and the people around me. I am now reading it for the second time after a few years and I realise how many positive changes I have made after the first reading. The book is easy and relaxing to read, although it has a very deep message. If everyone read the book, we would understand each other much better and life would be simpler.

Irena Mihevc Goodreads Reader
November 9, 2024

I met this book 'accidentally', but there is no coincidence. For me, it was a call. Wonderful book, revealing secrets, that we as people 'forgot' during time... Read it twice, you read two different books. Read it the third time, and you will read the third book. Everytime something new. PSI is the book that should be read by anyone.

Sanja Bergant Goodreads Reader
October 9, 2024

This amazing book made me think about what kind of a person I was in my past, and what kind of a person I wanna be in my future waaaay more than I'd like to admit. A good read indeed!

Kaja Bonča Goodreads Reader
July 17, 2025

This book is unique. A wonderful read that will take you into an inner journey to understand yourself and others much better, and hence drop the fights and disagreements. Peace and love are possible. I will read this book again and again. I highly recommend it to everyone!!

Bénédicte Maris Goodreads Reader
March 22, 2025

This book was an amazing journey and adventure into myself. It tells a story, but the story is really about the reader, and if you pay attention, the book almost forces you to realize things that you haven't consciously understood in the past. It was eye-opening and I'm looking forward to reading it again!

Jason Alberti Goodreads Reader
Read all 117 reviews on Goodreads

Countless benefits of reading [psi]

A revolutionary approach that unifies psychology like Mendeleev's periodic table did for chemistry.

Understand Your Psyche

Engage in self-reflection to uncover hidden aspects of your personality, leading to greater self-awareness.

How to Find True Love

Understand the essence of true love and how to cultivate it by focusing on genuine connections.

Overcome Fear

Utilise practical strategies to confront and manage fears, empowering yourself to live more confidently.

Improve Decision-Making

Make more informed and rational decisions by understanding your cognitive processes and thought patterns.

Make Life Easier

Simplify your life by aligning your actions with your core values, leading to greater ease and satisfaction.

Simple Understanding

Break down complex ideas into manageable concepts to make profound psychological insights accessible.

A Unique Reading Experience

A book that reads you

[psi] isn't just unique in content — its visual design mirrors the duality of the human psyche.

The story unfolds...

"Eros thus learns the truth. This revelation heals his pain, but in turn, Eros owes Life a favor: he must return love to humankind."

White text on black — the world as we perceive it
The truth reveals itself...

"We can't identify our character on our own. The reason for this is hidden in the fact that we evaluate ourselves using our predominant mind, which always takes our own thinking as the starting point."

Black text on white — the key revelations
[psi]
[psi]
[psi]
[psi]
[psi]
[psi]
[psi]
[psi]

Most of the book — white text on black pages, drawing you into the narrative

Key revelations — black text on white pages, signaling moments of truth

This deliberate contrast mirrors the shift between darkness and understanding — a reading experience you feel, not just read.

Buy [psi] Book Now  · €154,00

What is the [psi] book about?

[psi] offers a new understanding of our mind, providing a fresh perspective on our thoughts, relationships, and decision-making processes. Since life depends on how we think, [psi] won't just be a book for you — it's knowledge you can't afford to be without.

“Even though you may think you're reading the book, you will soon discover that actually the book is reading you.”

Premium hardcover binding

The book features a durable, high-quality hardcover binding designed to withstand extensive reading, ensuring longevity and a premium feel.

Visually striking cover design

The cover is thoughtfully designed to reflect the depth and psychological themes explored in the book, making it a visually appealing addition to any bookshelf.

Ideal for collectors and readers alike

With its robust hardcover format and aesthetically pleasing design, [psi] is not just a book — it's a valuable addition to any collection.

Moments from [psi] book events

[psi] book event — author and audience by piano
[psi] book event — speaker on stage with audience
[psi] book event — attentive audience
[psi] book event — stage with [psi] silhouette and books
[psi] book event — three readers in [psi] shirts
[psi] book event — visitors at [psi] booth
[psi] book — close-up of hands holding the open book
[psi] book event — reader at bookstore
[psi] book event — readers at [psi] display
Get the [psi] book now
[psi] Book - Premium Edition in Gift Box

About the Story

The story talks about Eros, a modern-day young man who runs away from home because of being disappointed in love. He ends up in an unusual world of all thoughts, where he meets Life — who reveals the first of seven secrets.

As the book continues, Eros finds himself in twelve completely different worlds, representing the psyches of twelve people and twelve human characters.

You will understand yourself and people around you in a way you never did before.

Visual & Aesthetic Beauty:Printed on fireproof paper. Comes in a premium gift box.

Share the Gift of [psi]

The best gift you can give someone is the gift of self-understanding. Share [psi] with the people you love.

"I have given it to my favorite people as a gift and they are also enraptured."

— Kathleen Freiberg, Verified Buyer
40000+ Copies sold
40000+ Copies sold
40000+ Copies sold

Gift [psi] to someone you love

The greatest gift is the gift of self-understanding. Send a personalized recommendation to a friend — we'll open your email app with a beautiful message ready to send.

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  • Book details & Goodreads rating included
  • Direct link to buy — opens in their email

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Got Questions?

Frequently Asked Questions

How long does shipping usually take?

We strive to deliver the [psi] book to your doorstep as fast as possible:

  • United States: 4 business days with DHL shipping
  • Europe: 2 business days with DPD shipping
  • Rest of the world: 4–10 business days with DHL shipping
Why is the [psi] book priced the way it is?

Because it's part of something much larger than a book — it's a mission to reach as many people as possible and return love to humanity. The [psi] book is entirely self-published. Every step — from translation and printing, to fairly paying the people involved, to sharing the message with the world — depends on support. The book is printed on uniquely durable, stone-coated paper designed to last over a thousand years. It's also coated in fire-resistant material. By purchasing this book, you're helping it travel and spread love.

Is [psi] available in other languages?

Currently, [psi] is available in English, German, Croatian, and Slovenian. There are no plans for further translations at this time.

How can I purchase [psi]?

[psi] is exclusively available for purchase online through the official website bookpsi.com.

Is there a return policy for [psi]?

We provide a 14-day return policy on [psi], provided the book is returned in its original condition.

Do you ship worldwide?

Yes, [psi] is shipped internationally to all countries.

Can I track my order once it's shipped?

Absolutely! You will receive a tracking number by email once your order has shipped, allowing you to follow your package's journey.

Are there any discounts available for bulk purchases?

Yes! Many of our customers order multiple copies — often as gifts for loved ones, friends, business partners, or for special occasions. Simply proceed to checkout to see the available bulk discounts.

What payment methods are accepted?

We accept all major credit and debit cards, as well as PayPal, Apple Pay, and Google Pay.

Can I gift [psi] as a gift?

Absolutely — you couldn't choose a more meaningful gift. At checkout, simply add the option of an extra book as a gift, and you'll receive special gift packaging with your purchase.