Three things are necessary for man to be saved: knowledge of what is to be believed, knowledge of what is to be desired, and knowledge of what is to be done.
Tria sunt homini necessaria ad salutem: scilicit scientia credendorum, scientia desiderandorum, et scientia operandorum.
Original text (Latin)
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Variants
Three things are necessary for the salvation of man: to know what he ought to believe; to know what he ought to desire; and to know what he ought to do.