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  5. If you are to be kept right, you must possess either good...

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.

Diogenes
Good Friend, Enemy, Hot
"Moralia". Book by Plutarch, circa 100 AD.
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.