Thought is the wind, knowledge the sail, and mankind the vessel. – Augustus William Hare and Julius Charles Hare, Guesses at Truth, by Two Brothers, 1827
No amount of energy will take the place of thought. A strenuous life with its eyes shut is a kind of wild insanity. – Henry Van Dyke Believing is easier than thinking. Hence so many more believers than thinkers. – Bruce Calvert

A man is not idle because he is absorbed in thought. There is a visible labor and there is an invisible labor – Victor Hugo
Sometimes I think and other times I am. – Paul Valéry, Variété: Cantiques spirituels, 1924
Few Minds Wear Out; More Rust Out. – Christian …
Few minds wear out; more rust out. – Christian N. Bovee
Opinion is that exercise of the human will which helps us to make a decision without information. – John Erskine
Men Can Live Without Air A Few Minutes, Without Wate…
Men can live without air a few minutes, without water for about two weeks, without food for about two months – and without a new thought for years on end. – Kent Ruth
The thoughts that come often unsought, and, as it were, drop into the mind, are commonly the most valuable of any we have. – John Locke, 16 May 1699. – . Men who borrow their opinions can never repay their debts. – George Savile, Marquess de Halifax, Miscellaneous Thoughts and Reflections
Some people do not become thinkers simply because their memories are too good. – Friedrich Wilhelm Nietzsche
- Chi Wen Tzu always thought three times before taking action. Twice would have been quite enough. – Confucius, Analects
- Impartial observers from other planets would consider ours an utterly bizarre enclave if it were populated by birds, defined as flying animals, that nevertheless rarely or never actually flew. They would also be perplexed if they encountered in our seas, lakes, rivers, and ponds, creatures defined as swimmers that never did any swimming. But they would be even more surprised to encounter a species defined as a thinking animal if, in fact, the creature very rarely indulged in actual thinking. – Steve Allen
Doubt is not a pleasant state of mind, but certainty is absurd. – Voltaire, 1767

