"It is a sound interpretive rule...that anything that cannot be accomplished except with the aid of threats or the actual exercise of violence against unoffending persons cannot be beneficial to one and all."

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Whereas young people become accomplished in geometry and mathematics, and wise within these limits, prudent young people do not seem to be found. The reason is that prudence is concerned with particulars as well as universals, and particulars become known from experience, but a young person lacks experience, since some length of time is needed to produce it.

— Aristotle