There is a need for what [Michael] Polanyi calls the critique of doubt. When we undertake to doubt any statement, we do so on the basis of beliefs which—in the act of doubting—we do not doubt. I can only doubt the truth of a statement on the ground of other things—usually a great many things—which I believe to be true. It is impossible at the same time to doubt both the statement, and the beliefs on the basis of which the statement is doubted.
Progress is born of doubt and inquiry. The Church never doubts, never inquires. To doubt is heresy, to inquire is to admit that you do not know—the Church does neither.
You doubt because you love truth.
When truth was revealed to me I never doubted it.
I still doubt it will work."
"You'd doubt the sun's rising if you weren't proven wrong each day," Raoden
said with a smile.
Doubt is the offspring of knowledge: the savage never doubts at all.
Believe those who seek the truth, doubt those who find it; doubt all, but do not doubt yourself.
Who never doubted never half believed
Where doubt there truth is—'t is her shadow.
A sadder vision yet: thine aged sire
Shaming his hoary locks with treacherous wile!
And dost thou now doubt Truth to be a liar?
And wilt thou die, that hast forgot to smile?
My principal sin is doubt. I doubt everything, and am in doubt most of the time.