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.

Mill:

It is doubtful whether all the machines that have been invented have made any reduction in the daily toil of man.

novalis:

In order to know the truth correctly, we must first doubt it and argue with it and argue with it.

Europe:

Hypocrites always doubt the honesty of others.

United States:

The enemies we do not suspect are the most dangerous.

UK:

The ignorant doubts nothing.

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:

Poverty of knowledge can give rise to many doubts.

Doubt is an element of criticism, and the tendency of criticism must be skeptical.

------Disraeli

Doubt It can destroy yesterday's faith and open the way for tomorrow's faith.

------Romain Rolland

A frank person will never give up frank questions.

------W. Malone

The process of scientific development is a leap starting from curiosity and doubt.

------Ai Yin Stan

Faith and doubt complement each other. Without doubt, there is no true faith.

------Heise