An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.
The vitality of thought is in adventure. Ideas won't keep. Something must be done about them. When the idea is new, its custodians have fervor, live for it, and if need be, die for it.
The pursuit of mathematics is a divine madness of the human spirit.
I consider Christian theology to be one of the great disasters of the human race.
It is not paradox to say that in our most theoretical moods we may be nearest to our most practical applications.
There is a technique, a knack, for thinking, just as there is for doing other things. You are not wholly at the mercy of your thoughts, any more than they are you. They are a machine you can learn to operate.
Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.
The chief error in philosophy is overstatement.
The greatest invention of the nineteenth century was the invention of the method of invention.
Knowledge keeps no better than fish.
Do not teach too many subjects and what you teach, teach thoroughly.
Without adventure all civilization is full of decay. Adventure rarely reaches its predetermined end. Columbus never reached China.
Almost all new ideas have a certain aspect of foolishness when they are first produced.
Order is not sufficient. What is required, is something much more complex. It is order entering upon novelty; so that the massiveness of order does not degenerate into mere repetition; and so that the novelty is always reflected upon a background of system.
Value is coextensive with reality.
Some of the finest moral intuitions come to quite humble people. The visiting of lofty ideas doesn't depend on formal schooling.
The world is shocked, or amused, by the sight of saintly old people hindering in the name of morality the removal of obvious brutalities from a legal system.
Aristotle discovered all the half-truths which were necessary to the creation of science.
Seek simplicity, and distrust it.
Dogmatism is the anti-Christ of learning.
The factor in human life provocative of a noble discontent is the gradual emergence of a sense of criticism, founded upon appreciation of beauty, and of intellectual distinction, and of duty.
Apart from God every activity is merely a passing whiff of insignificance.
It is impossible not to feel stirred at the thought of the emotions of man at certain historic moments of adventure and discovery - Columbus when he first saw the Western shore, Pizarro when he stared at the Pacific Ocean, Franklin when the electric spark came from the string of his kite, Galileo when he first turned his telescope to the heavens. Such moments are also granted to students in the abstract regions of thought, and high among them must be placed the morning when Descartes lay in bed and invented the method of co-ordinate geometry.
Intelligence is quickness to apprehend as distinct form ability, which is capacity to act wisely on the thing apprehended.
Human nature loses its most precious quality when it is robbed of its sense of things beyond, unexplored and yet insistent.
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