As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task. (Diogenes of Sinope)

As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.

Diogenes of Sinope

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former good instruct latter man matter needs self-preservation take task friends

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