homo homini lupus

Etymology
From +  +. As is typical of Latin proverbs, the sentence is nominal (lacks the copular ).

First attested in Erasmus' Adagia, a variation on the proverb alluded to by Plautus in Lupus est homō hominī, nōn homō, quom quālis sit nōn nōvit ("To a human, a human is not a human but a wolf when he doesn't know what the other one is like"). Compare Erasmus' Hominī nūlla fera perniciōsior quam homō ("No beast is more dangerous to a human than another human").

Phrase

 * 1) man is a wolf to man