When you doubt, abstain.
Ambrose Bierce

All pain is either severe or slight, if slight, it is easily endured; if severe, it will without doubt be brief.
Marcus Tullius Cicero

Doubt is not the opposite of faith; it is one element of faith.
Paul Tillich

The courage to be is rooted in the God who appears when God has disappeared in the anxiety of doubt.
Paul Tillich

When in doubt, go for the dick joke.
Robin Williams

If it doesn't work out there will never be any doubt that the pleasure was worth all the pain.
Jimmy Buffett

There is too much fathering going on just now and there is no doubt about it fathers are depressing.
Gertrude Stein

Who shall decide when doctors disagree, And soundest casuists doubt, like you and me?
Alexander Pope

How prone to doubt, how cautious are the wise!
Alexander Pope

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

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.
Nathaniel Hawthorne

Some say that AIDS came from the monkeys, and I doubt that because we have been living with monkeys from time immemorial, others say it was a curse from God, but I say it cannot be that.
Wangari Maathai

Test yourself on mankind. It is something that makes the doubter doubt, the believer believe.
Franz Kafka

Wonder rather than doubt is the root of all knowledge.
Abraham Joshua Heschel

Only the most deluded of us could doubt the necessity of this war.
John McCain

I don't doubt the sincerity of my Democratic friends. And they should not doubt ours.
John McCain

There can be no doubt that the average man blames much more than he praises. His instinct is to blame. If he is satisfied he says nothing; if he is not, he most illogically kicks up a row.
Golda Meir

I think it's the people who have no doubt that every word they put down is gold that probably don't write very well.
Dean Koontz

But what of black women?... I most sincerely doubt if any other race of women could have brought its fineness up through so devilish a fire.
W. E. B. Du Bois

There's no doubt I expect to die in prison.
Jack Kevorkian