If you don't doubt, you can't see the truth, so I hope everyone will be skeptical and don't be carried away by the established theory.

-(Li Siguang) Tacitus: The second heir is always suspected and resented. Romain rolland: Doubt can destroy yesterday's faith and open the way for tomorrow's faith.

England: Doubt is the key to knowledge. Britain: There is no need to prove what no one doubts.

Germany: Young people believe in many fake things, while old people doubt many real things. Mill: It is doubtful whether all the invented machines have lightened the daily work of human beings.

Novalis: In order to understand the truth correctly, we must first doubt it and argue with it. Europe: hypocrites always doubt the honesty of others.

America: The enemy we don't doubt is the most dangerous. England: People who know nothing will not doubt anything.

Maurice Martin Dugard: Some people are so smart that you want to know if there is anything else that interests them. Unamuno: Real science first teaches people doubt and confusion.

Anonymity: The evidence tells us where to focus our doubts. Bacon: Lack of knowledge is the most suspicious.

Doubt is an element of criticism, and the tendency of criticism must be skeptical. -disraeli Doubt can destroy yesterday's faith and open the way for tomorrow's faith. -romain rolland Frank people will never give up their frank doubts. -W. Malone The process of scientific development is a leap from curiosity to doubt. -