Aristotle discovered all the half-truths which were necessary to the creation of science.
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.
Intelligence is quickness to apprehend as distinct form ability, which is capacity to act wisely on the thing apprehended.
Value is coextensive with reality.
Dogmatism is the anti-Christ of learning.
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.
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.
Seek simplicity, and distrust it.
No science can be more secure than the unconscious metaphysics which tacitly it presupposes.
The learned tradition is not concerned with truth, but with the learned adjustment of learned statements of antecedent learned people.
Peace is self-control at its widest-at the width where the "self" has been lost, and interest has been transferred to coordinations wider than personality.
The only use of knowledge of the past is to equip us for the present.
Intolerance is the besetting sin of moral fervour.
True courage is not the brutal force of vulgar heroes, but the firm resolve of virtue and reason.
The 'silly question' is the first intimation of some totally novel development.
One main factor in the upward trend of animal life has been the power of wandering.
Religion is what the individual does with his own solitariness. Thus religion is solitariness; and if you are never solitary, you are never religious.
No period of history has ever been great or ever can be that does not act on some sort of high, idealistic motives, and idealism in our time has been shoved aside, and we are paying the penalty for it.
Religion increasingly is tending to degenerate into a decent formula wherewith to embellish a comfortable life.
The science of pure mathematics, in its modern developments, may claim to be the most original creation of the human spirit.
Life is an offensive, directed against the repetitious mechanism of the Universe.
Education should turn out the pupil with something he knows well and something he can do well.
Human nature loses its most precious quality when it is robbed of its sense of things beyond, unexplored and yet insistent.
Speech is human nature itself, with none of the artificiality of written language.
It belongs to the self-respect of intellect to pursue every tangle of thought to its final unravelment.
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