Quotes about doubt:

(1) Doubt is the beginning of thinking and the end of learning. ——Confucius

(2) Thinking starts with questions and surprise. ——Aristotle

(3) He who does not doubt when he is doubtful has never learned; learning requires doubting. ——Zhang Zai

(4) Deep in the human soul, there is a deep-rooted need, which is to hope that oneself can be a discoverer, researcher, and explorer. In the spiritual world of children, this need is particularly strong. ——Suhomlinsky

(5) The key to all science is undoubtedly the question mark. ——Balzac

(6) It is never too late to correct your mistakes. ——Shakespeare

(7) Who has no fault? If you can change your past, there is no greater good.

——"Zuo Zhuan? The Second Year of Xuangong"