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doubt
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“Doubt is the father of invention.”
— Ambrose Bierce
“It is beyond a doubt that all our knowledge that begins with experience.”
— Immanuel Kant
“Our doubts are traitors and make us lose the good we oft might win by fearing to attempt.”
— William Shakespeare
“Any truth is better than indefinite doubt.”
— Arthur Conan Doyle
“They who have conquered doubt and fear have conquered failure.”
— James Allen
“Doubt is not the opposite of faith; it is one element of faith.”
— Paul Tillich