"Plutarch has written an essay on the benefits which a man may receive from his enemies; and among the good fruits of enmity, mentions this in particular, that by the reproaches which it casts upon us, we see the worst side of ourselves."

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In your friendships and in your enmities let your confidence and your hostilities have certain bounds; make not the former dangerous, nor the latter irreconcilable. There are strange vicissitudes in business.

— Lord Chesterfield