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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.

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 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.

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?

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.

Wonder rather than doubt is the root of all knowledge.

Without reflection, we go blindly on our way, creating more unintended consequences, and failing to achieve anything useful.

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