To deny, to believe, and to doubt absolutely -- this is for man what running is for a horse.
Doubt is part of all religion. All the religious thinkers were doubters.
To have doubted one's own first principles is the mark of a civilized man.
Jealousy lives upon doubts, it becomes madness or ceases entirely as soon as we pass from doubt to certainty.
Galileo called doubt the father of invention; it is certainly the pioneer.
Don't waste life in doubts and fears; spend yourself on the work before you, well assured that the right performance of this hour's duties will be the best preparation for the hours and ages that will follow it.
The basic stimulus to the intelligence is doubt, a feeling that the meaning of an experience is not self-evident.
If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties.
The only limit to our realization of tomorrow will be our doubts of today.
No man likes to have his intelligence or good faith questioned, especially if he has doubts about it himself.
Doubt is the father of invention.
Never doubt that a small group of thoughtful citizens can change the world. Indeed, it is the only thing that ever has.
Believe those who are seeking the truth; doubt those who find it.
The relationship between commitment and doubt is by no means an antagonistic one. Commitment is healthiest when it is not without doubt but in spite of doubt.
Doubt is the beginning, not the end, of wisdom.
Doubt whom you will, but never yourself.
If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.
If doubt is challenging you and you do not act, doubts will grow. Challenge the doubts with action and you will grow. Doubt and action are incompatible.
Believe while others are doubting.
Know without a doubt that you were made for amazing things.
Nobody becomes great without self-doubt. But you can't let it consume you.
Don't ever aim your doubt at yourself. Laugh at yourself, but don't doubt yourself.
For, were it not good that evil things should also exist, the omnipotent God would almost certainly not allow evil to be, since beyond doubt it is just as easy for Him not to allow what He does not will, as for Him to do what He will.
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