There is nothing more dreadful than the habit of doubt. Doubt separates people. It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kills.
Buddha

You know, my faith is one that admits some doubt.
Barack Obama

When in doubt tell the truth.
Mark Twain

It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.
Mark Twain

It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt.
Abraham Lincoln

Better to remain silent and be thought a fool than to speak out and remove all doubt.
Abraham Lincoln

Understand this law and you will then know, beyond room for the slightest doubt, that you are constantly punishing yourself for every wrong you commit and rewarding yourself for every act of constructive conduct in which you indulge.
Napoleon Hill

Wise men, when in doubt whether to speak or to keep quiet, give themselves the benefit of the doubt, and remain silent.
Napoleon Hill

Doubt is a pain too lonely to know that faith is his twin brother.
Kahlil Gibran

Love and doubt have never been on speaking terms.
Kahlil Gibran

When in doubt, don't.
Benjamin Franklin

No doubt exists that all women are crazy; it's only a question of degree.
W. C. Fields

Modest doubt is called the beacon of the wise.
William Shakespeare

Truth is beautiful, without doubt; but so are lies.
Ralph Waldo Emerson

I have seen how the foundations of the world are laid, and I have not the least doubt that it will stand a good while.
Henry David Thoreau

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

I, with a deeper instinct, choose a man who compels my strength, who makes enormous demands on me, who does not doubt my courage or my toughness, who does not believe me naive or innocent, who has the courage to treat me like a woman.
Anais Nin

Ezra was right half the time, and when he was wrong, he was so wrong you were never in any doubt about it.
Ernest Hemingway

Inaction breeds doubt and fear. Action breeds confidence and courage. If you want to conquer fear, do not sit home and think about it. Go out and get busy.
Dale Carnegie

Beyond a doubt truth bears the same relation to falsehood as light to darkness.
Leonardo da Vinci