Doubt is not a pleasant condition, but certainty is absurd.
Letter to Frederick II of Prussia (April 6, 1767)
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There is something pagan in me that I cannot shake off. In short, I deny nothing, but doubt everything.
Test yourself on mankind. It is something that makes the doubter doubt, the believer believe.
He who Doubts from what he sees, will ne’er Believe, do what you Please. If the Sun and Moon should doubt, they’d immediately Go...
Johann Wolfgang von Goethe
November 21, 1694 - May 30, 1778