"Mathematics is entirely free in its development, and its concepts are only linked by the necessity of being consistent, and are co-ordinated with concepts introduced previously by means of precise definitions."

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The concepts "soul", "spirit" and last of all the concept "immortal soul" were invented in order to despise the body, in order to make it sick - "holy" - in order to cultivate an attitude of appalling disrespect for all things in life which deserve to be treated seriously i.

— Friedrich Nietzsche