"Action is coarsened thought; thought becomes concrete, obscure, and unconscious." - Henri-Frédéric Amiel

"Under conditions of tyranny it is far easier to act than to think." - Hannah Arendt, quoted in W.H. Auden's A Certain World

"It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle

"The actuality of thought is life." - Aristotle, Metaphysics, book XII, ch. 7

"If you think you can, you can. And if you think you can't, you're right." - Mary Kay Ash

"Write down the thoughts of the moment. Those that come unsought for are commonly the most valuable." - Francis Bacon

"Think like a man of action, act like a man of thought." - Henri Bergson

"I reject 'get it done', 'make it happen' thinking. I want to slow things down so I understand them better." - Governor Jerry Brown

"If we are not ashamed to think it, we should not be ashamed to say it." - Cicero

"What was once thought can never be unthought." - Friedrich Dürrenmatt, The Physicists

"Some people read because they are too lazy to think." - Georg Christoph Lichtenberg

"A thought often makes us hotter than a fire." - Henry Wadsworth Longfellow

"Such as are your habitual thoughts, such also will be the character of your mind; for the soul is dyed by the thoughts." - Marcus Aurelius, Meditations

"The universe is change; our life is what our thoughts make it." - Marcus Aurelius, Meditations, IV, 3

"There are two distinct classes of what are called thoughts: those that we produce in ourselves by reflection and the act of thinking and those that bolt into the mind of their own accord." - Thomas Paine

"A Human Thought is an actual EXISTENCE, and a Force and Power, capable of acting upon and controlling matter as well as mind." - Albert Pike

"If we were all given by magic the power to read each other's thoughts, I suppose the first effect would be to dissolve all friendships." - Bertrand Russell

"Be great in act, as you have been in thought." - William Shakespeare

"Time to me this truth has taught, (Tis a treasure worth revealing) More offend from want of thought Than from want of feeling." - Charles Swain

"Men use thought only to justify their wrong doings, and speech only to conceal their thoughts." - Voltaire

"All the problems of the world could be settled easily if men were only willing to think. The trouble is that men very often resort to all sorts of devices in order not to think, because thinking is such hard work." - Thomas J. Watson

"To fly as fast as thought, you must begin by knowing that you have already arrived." - Bach, Richard

"No, no, you're not thinking, you're just being logical." - Bohr, Neils (1885-1962)

"The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them." - Bragg, Sir William

"The fact is that if you have not developed language, you simply don't have access to most of human experience, and if you don't have access to experience, then you're not going to be able to think properly." - Chomsky, Noam in 'Language and Problems of Knowledge: the Managua Lectures' 1988

"Words are both better and worse than thoughts, they express them, and add to them; they give them power for good or evil; they start them on an endless flight, for instruction and comfort and blessing, or for injury and sorrow and ruin." - Edwards, Tryon (1809-1894)

"When I examine myself and my methods of thought, I come to the conclusion that the gift of fantasy has meant more to me than any talent for abstract, positive thinking." - Einstein, Albert

"The real danger is not that computers will begin to think like men, but that men will begin to think like computers." - Harris, Sydney

"A man can stand a lot as long as he can stand himself. He can live without hope, without books, without friends, without music, as long as he can listen to his own thoughts." - Munth, Axel

"As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress." - Oppenheimer, J. Robert (1904-1967)

"We come to feel as we behave." - Pearsall, Paul

"Thinking is the talking of the soul with itself." - Plato (c428-348 B.C.)

"I cannot teach anybody anything, I can only make them think." - Socrates

"Brood about death and you hasten your demise." - Unknown

"If you think about disaster, then you will get it." - Unknown

"Police Officer: We believe foul play was involved. Tommy Patel: Surely you don't think I... Police Officer: I don't think anything, sir. I'm a police officer." - Unknown in 'Splitting Heirs'

"Language shapes the way we think, and determines what we can think about." - Whorf, Benjamin

"The fact that logic cannot satisfy us awakens an almost insatiable hunger for the irrational." - Wilson, A. N.