prolog

Chapter.
01 I think, therefore I am

What kind of being am I?
Do I feel useless?
Are you sure you know yourself well?
If you want to prove yourself
How to Expand Your Being Through Questions

Chapter.
02 Doubt everything possible

How far have you doubted?
A life never doubted is a life never truly lived.
People only believe what they want to believe.
If you want to live wisely, learn to doubt.
Things to remember when you're unsure

Chapter.
03 The Power of Thought to Make Life Clear

The fairest property in the world
Emotions and Reason
Four Principles for Rational Thinking
What are your biases?
Don't trust your senses

Chapter.
04 Questions to Understand Me

Why do I always have so many thoughts?
Who are you to deceive me?
Freedom from the perspective of reason
Is my life going as it is destined?
Things I have to give up to protect myself

Chapter.
05 Criteria to keep in mind when choosing a life

Match your desires
Conquer yourself before trying to conquer the world.
The best revenge from a rational perspective
If I don't change, ask a new question.

Chapter.
06 When I don't know my feelings

Emotions are not something to be suppressed.
What is the real reason I am angry?
To lead without being swayed by emotions
True peace is built on emotion.

Chapter.
07 How should we treat others?

The most foolish idea in the world
Where do misunderstandings begin and how are they resolved?
My desire for recognition makes me more anxious.
If you want to avoid hurting others, you must first learn boundaries.
You must have the courage to be hated.

Chapter.
08 How to set standards for life

What's right for me, not what's right for me
Why You Should Move Forward Even When You're Unsure
In the end, only I know my feelings.
A life you can explain to yourself

Chapter.
09 Between Reason and Solitude

The more you think, the more alone you become.
How to Survive Time Alone
The feelings that come out when you're alone are real
Take advantage of the pause
There are moments when you are alone but not alone.

Chapter.
10 Life is still worth thinking about

The courage to reconnect, the will to live again
Life is not to be understood, but to be lived.
Be the one who leaves questions rather than understanding.
One question that starts again at the end

Author's Note

In uncertain times, what can we believe in and live by?

Descartes says:
I doubt everything, but at the very moment I doubt, I know that I exist.
This book shows that philosophy is not about grand ideas, but about putting them into practice for a better life.
As readers follow Descartes's lines, they will ask their own questions and eventually find their own answers.
There is only one question this book poses.
Are you thinking to yourself now?