If a man's wit be wandering, let him study the mathematics; for in demonstrations, if his wit be called away never so little, he must begin again.
The cowboys have a way of trussing up a steer or a pugnacious bronco which fixes the brute so that it can neither move nor think. This is the hog-tie, and it is what Euclid did to geometry.
With my full philosophical rucksack I can only climb slowly up the mountain of mathematics.
The most savage controversies are about matters as to which there is no good evidence either way.
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