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Doubt quotes and quotations

There are no creeds in mathematics.
Peter F. Drucker

The only limit to our realization of tomorrow will be our doubts of today.
Franklin Delano Roosevelt

You may be deceived if you trust too much, but you will live in torment if you don't trust enough.
Frank Crane

Aerodynamically the bumblebee shouldn't be able to fly, but the bumblebee doesn't know that so it goes on flying anyway.
Mary Kay Ash

Only do what your heart tells you.
Princess Diana

Creativity requires the courage to let go of certainties.
Erich Fromm

Don't waste life in doubts and fears; spend yourself on the work before you, well assured that the right performance of this hour's duties will be the best preparation for the hours and ages that will follow it.
Ralph Waldo Emerson

Doubt is part of all religion. All the religious thinkers were doubters.
Isaac Bashevis Singer

As we know, there are known knowns. There are things we know we know. We also know there are known unknowns. That is to say we know there are some things we do not know. But there are also unknown unknowns, the ones we don't know we don't know.
Donald Rumsfeld

It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
G. K. Chesterton

Trust him not with your secrets, who, when left alone in your room, turns over your papers.
Johann Kaspar Lavater

Our distrust is very expensive.
Ralph Waldo Emerson

The relationship between commitment and doubt is by no means an antagonistic one. Commitment is healthiest when it is not without doubt but in spite of doubt.
Rollo May

Unthinking faith is a curious offering to be made to the creator of the human mind.
John A. Hutchinson

It is the tension between creativity and skepticism that has produced the stunning and unexpected findings of science.
Carl Sagan

There are two ways to slide easily through life: to believe everything or to doubt everything; both ways save us from thinking.
Theodore Rubin

We must learn our limits. We are all something, but none of us are everything.
Blaise Pascal

One's first step in wisdom is to question everything - and one's last is to come to terms with everything.
Georg C. Lichtenberg

If you must tell me your opinions, tell me what you believe in. I have plenty of douts of my own.
Johann Goethe

Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever or whatever abysses nature leads, or you will learn nothing.
Thomas H. Huxley

To deny, to believe, and to doubt absolutely -- this is for man what running is for a horse.
Blaise Pascal

If you're not confused, you're not paying attention.
Tom Peters

Nobody is more dangerous than he who imagines himself pure in heart, for his purity, by definition, is unassailable.
James Baldwin

Everything is vague to a degree you do not realize till you have tried to make it precise.
Bertrand Russell

I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth.
Umberto Eco

Do not let what you cannot do interfere with what you can do.
John Wooden

When one admits that nothing is certain one must, I think, also add that some things are more nearly certain than others.
Bertrand Russell

The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next.
Ursula K. LeGuin

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

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

Believe those who are seeking the truth; doubt those who find it.
Andre Gide

I've put in so many enigmas and puzzles that it will keep the professors busy for centuries arguing over what I meant, and that's the only way of insuring one's immortality.
James Joyce

What man actually needs is not a tensionless state but rather the striving and struggling for some goal worthy of him. What he needs is not the discharge of tension at any cost, but the call of a potential meaning waiting to be fulfilled by him.
Victor Frankl

There are two ways to slide easily through life: to believe everything or to doubt everything; both ways save us from thinking.
Alfred Korzybski

Winning is a habit. Unfortunately, so is losing.
Vince Lombardi