Doubt is a sign of developing expertise.

Doubt is part of all religion. All the religious thinkers were doubters.

Doubt is the incentive to truth and inquiry leads the way.

Doubt whom you will, but never yourself.

Doubt is the essence of Christ.

Doubt of the reality of love ends by making us doubt everything.

Doubt is like frostbite, shivering at the edges of my mind.

Doubt is part of searching. Same as faith.

Doubt was much more energy efficient than conviction.

Doubt is the pinprick in the life raft.

Doubt is an acceptable risk for happiness.

Doubt is how you find God.

Doubt tortures me. There is a twist in me, my fear of interpretation.

Doubt everything.

Doubt is an uncomfortable condition, but certainty is a ridiculous one.

Doubt … is an illness that comes from knowledge and leads to madness.

Doubt is the father of invention.

Doubt is one of the names of intelligence.

Doubt begins only at the last frontiers of what is possible.

Doubt is a pain too lonely to know that faith is his twin brother.

Doubt is an illness that comes from knowledge and leads to madness.

Doubt grows with knowledge.

Doubt is the origin of wisdom.

Doubt is not a pleasant condition, but certainty is absurd.

Doubt can only be removed by action.

Doubt is invariably the result of want or weakness of faith.

Doubt must be no more than vigilance, otherwise it can become dangerous.

Who never doubted never half believed.

Who knows nothing doubts nothing.

Who doubts errs not.

Who carries doubtful people to his house, will doubtless from his carriage something lose.

When in doubt, surprise them.

When in doubt of what is right, consult your pillow overnight.

Twin fools: one doubts nothing, the other everything.

To believe in certainty, we must begin by doubting.

The person who trusts is happy; the person who doubts is wise.

The believer is happy; the doubter is wise.

Quiet people, whether wise or dull, get the benefit of the doubt.

Never try to prove what nobody doubts.

Love, should i escape your snares, i doubt that i can be trapped by any other means.

Jealousy is nourished by doubt.

Inquire seven times then doubt a person.

If there is still doubt do not accuse.

He who trusts is happy; the doubter is wise.

He who knows nothing neither doubts nor fears anything.

He who knows nothing doubts nothing.

He who doubts nothing knows nothing.

He doubts nothing who knows nothing.

Even doubtful accusations leave a stain behind them.