You cannot see the truth without doubting it, so I hope that everyone will adopt a skeptical attitude and not be overwhelmed by established doctrines.

--(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.

UK: Doubt is the key to knowledge. UK: What no one suspects needs no confirmation.

Germany: Young people believe many false things, and old people doubt many true things. Müller: It is doubtful whether all the machines that have been invented have any lessened the daily toil of man.

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

United States: The most dangerous enemies are those we do not suspect. UK: A man who knows nothing doubts anything.

Maurice Madan Dugar: Some people are so smart that you wonder what else could interest them. Unamuno: Real science first teaches people to doubt and to be confused.

Anonymous: The evidence tells us where to focus our suspicion. Bacon: The most poverty-stricken of knowledge can give rise to many doubts.

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 Roland A frank person will never give up frank questions. ------W. Malone The process of scientific development is a leap starting from curiosity and doubt. ------Love Einstein Faith and doubt complement each other. Without doubt, there is no true faith. ------Heise.