Doubtful quotes:

Doubt: Doubt is the first step towards philosophy

The process of scientific discovery is a leap starting from curiosity and doubt . ——(American scientist) Einstein

Science is always unfair. If it does not ask ten questions, it will never solve a problem. ——(Irish writer) Bernard Shaw

In fact, only after medical technology learned to criticize itself did it become a medical science and make great progress by critically revising medical dogma. ——(British chemist) Karl Popper

The doubter is the opportunity for enlightenment. A moment of enlightenment, a moment of progress. ——(Ancient Chinese calligrapher) Chen Xianzhang

Great doubt leads to great enlightenment, small doubt leads to small enlightenment, and no doubt leads to no enlightenment. ——(ancient Chinese philosopher) Zhu Shi

If you want to understand a book, you must first seek to understand it. ——(Chinese democrats) Breaking into one and many

The promise of a thousand people is not as good as the bay of one person. ——(Ancient Chinese historian) Sima Qian

Revaluation of all values: That is my formula for the highest self-affirmation activity of mankind. ——(German philosopher) Nietzsche

Pure sweetness is for children and fools. ——(Spanish thinker) Gracian

What is philosophy? Philosophy is about casting doubt and exploration on some common problems that everyone thinks are not problems. ——(Chinese writer) Zhao Xinshan

Doubt is not the opposite of faith, but an element of faith. ——(French writer) Romain Rolland

Doubt can destroy yesterday’s faith and open the way for tomorrow’s faith. ——(French writer) Romain Rolland

Faith and doubt complement each other. Without doubt, there is no true faith. ——(German writer) Hesse

The only limit to our understanding of tomorrow depends on our doubts today. ——(American politician) Roosevelt

If you want to be a true seeker of truth, there should be at least a period in your life when you should be as skeptical as possible about everything. ——(French philosopher) Descartes

To pursue truth, I must doubt everything as much as possible once in my life. ——(French philosopher) Descartes

Doubt is infinite inquiry. ——(Ancient Greek philosopher) Socrates

The eyes of doubt are like the eyes of an owl. They can only be seen in the dark, but light can make them lose their sight. ——(Hungarian writer) Jokaj More

Great souls yearn for doubt. ——(German philosopher) Nietzsche

Really successful people essentially bleed rebellious blood. ——(French writer) Victor Hugo