There was a castle called Doubting Castle, the owner whereof was Giant Despair.
Doubt is the father of invention.
Doubt is the vestibule through which all must pass before they can enter into the temple of wisdom.
Christian N. Bovee
Doubt whom you will, but never yourself.
Franklin Delano Roosevelt
The only limit to our realization of tomorrow will be our doubts about reality.
The fearful unbelief is unbelief in yourself.
Our doubts are traitors, and make us lose the good we oft might win by fearing to attempt.
Francois de La Rochefoucauld
Jealousy lives upon doubts, it becomes madness or ceases entirely as soon as we pass from doubt to certainty.
Modest doubt is called the beacon of the wise.
The trouble with the world is that the stupid are cocksure and the intelligent full of doubt.
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