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To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection.

There are two ways to slice easily thorugh life; to believe everything or to doubt everything. Both ways save us from thinking.

Doubt is an uneasy and dissatisfied state from which we struggle to free ourselves and pass into the state of belief; while the latter is a calm and satisfactory state which we do not wish to avoid, or to change to a belief in anything else.

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

To doubt God is to doubt one's own conscience, and in consequence, it would be to doubt everything; and then what is life for?

However you arrive at the ability to ignore self-doubt - if you can acquire it or possess it or find it or discover it - move beyond self-doubt.

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

Wonder rather than doubt is the root of all knowledge.

The deplorable mania of doubt exhausts me. I doubt about everything, even my doubts.

Doubt, the essential preliminary of all improvement and discovery, must accompany the stages of man's onward progress. The faculty of doubting and questioning, without which those of comparison and judgment would be useless, is itself a divine prerogative of the reason.