Deep doubts, deep wisdom; small doubts, little wisdom.

Deep doubts, deep wisdom; small doubts, little wisdom.

The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people read more

The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts.

Uncertain ways unsafest are,
And doubt a greater mischief than despair.

Uncertain ways unsafest are,
And doubt a greater mischief than despair.

To have doubted one's own first principles, is the mark of a civilized man.

To have doubted one's own first principles, is the mark of a civilized man.

Any belief worth having must survive doubt

Any belief worth having must survive doubt

Doubt is uncomfortable, certainty is ridiculous.

Doubt is uncomfortable, certainty is ridiculous.

Who never doubted, never half believed. Where doubt is, there truth is -- it is her shadow.

Who never doubted, never half believed. Where doubt is, there truth is -- it is her shadow.

The believer is happy; the doubter is wise.

The believer is happy; the doubter is wise.

Doubt is the father of invention.

Doubt is the father of invention.