That which is good for the enemy harms you, and that which is good for you harms the enemy.

Quello che giova al nimico nuoce a te, e quel che giova a te nuoce al nimico.

Original text (Italian)

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Notes from Wikiquote

Rule 1 of Lord Fabrizio Colonna (Modern Italian uses nemico instead of nimico)

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Attribution

Quote text and notes from Wikiquote: Niccolò Machiavelli (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.