Logic, too, also rests on assumptions that do not correspond to anything in the real world, e.g., on the assumption that there areequal things, that the same thing is identical at different points in time: but this science arose as a result of the opposite belief (that such things actually exist in the real world). And it is the same with mathematics, which would certainly never have arisen if it had been understood from the beginning that there is no such thing in nature as a perfectly straight line, a true circle, and absolute measure.
Friedrich NietzscheHow lovely it is that there are words and sounds. Are not words and sounds rainbows and illusive bridges between things which are eternally apart?
Friedrich NietzscheWherever primitive man put up a word, he believed he had made a discovery. How utterly mistaken he really was! He had touched a problem, and while supposing he had solved it, he had created and obstacle to its solution. Now, with every new knowledge we stumble over flint-like and petrified words and, in so doing, break a leg sooner than a word.
Friedrich Nietzsche