The skeptic does not mean him who doubts, but him who investigates or researches, as opposed to him who asserts and thinks that he has found.
Faith which does not doubt is dead faith.
True science teaches, above all, to doubt and be ignorant.
Those who say they believe in God and yet neither love nor fear Him, do not in fact believe in Him but in those who have taught them that God exists. Those who believe that they believe in God, but without any passion in their heart, any anguish of mind, without uncertainty, without doubt, without an element of despair even in their consolation, believe only in the God-idea, not in God.
Life is doubt, and faith without doubt is nothing but death.
The supreme triumph of reason is to cast doubt upon its own validity.
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