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.
If you are to be kept right, you must possess either good friends or red-hot enemies. The one will warn you, the other will expose you.
Other dogs bite only their enemies, whereas I bite also my friends in order to save them.
To arrive at perfection, a man should have very sincere friends or inveterate enemies; because he would be made sensible of his good or ill conduct, either by the censures of the one or the admonitions of the other.
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