Non decipitur qui scit se decipi

Non decipitur qui scit se decipi. He is not deceived who knows himself to be deceived. 5 co. 60.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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As the ancient legal maxim goes, Non decipitur qui scit se decipi (He is not deceived he who knows himself to have been deceived).