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Doubt is the beginning, not the end, of wisdom.

He who knows nothing, doubts nothing.

The road to perseverance lies by doubt.

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

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

Laugh at yourself, but don't ever aim your doubt at yourself. Be bold. When you embark for strange places, don't leave any of yourself safely on shore. Have the nerve to go into unexplored territory.

When you doubt, abstain.

No man likes to have his intelligence or good faith questioned, especially if he has doubts about it himself.

In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.

I respect faith, but doubt is what gets you an education.

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

Faith keeps many doubts in her pay. If I could not doubt, I should not believe.

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

Just think of the tragedy of teaching children not to doubt.

Men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt.

Modest doubt is called the beacon of the wise.

Our doubts are traitors, and make us lose the good we oft might win by fearing to attempt.