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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 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 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