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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 the middle position between knowledge and ignorance. It encompasses cynicism but also genuine questioning.

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

A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it.

The main battle is to make people realise that doubt is important. Doubt is good. The 'don't know' answer sometimes is the box you should tick, and it's about not being scared about that fact. Even the greatest minds don't know everything.

A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms agains himself. He makes his failure certain by himself being the first person to be convinced of it.

Wonder rather than doubt is the root of all knowledge.

To believe with certainty we must begin with doubting.

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, 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.