Latin, literally "the descent of Avernus (is) easy" ["Aeneid," VI.126], in reference to Avernus, a deep lake near Puteoli, a reputed entrance to the underworld; hence, "it is easy to slip into moral ruin."
Then comes the facilis descensus averni, and the sed revocare gradum hoc opus, hic labor est.
facilis descensus averni—sed revocare gradum—hic opus, hic labor est.
“facilis descensus averni,” observed Joe, making a brilliant sally in a foreign tongue.
facilis descensus averni, Sed revocare gradum Hoc opus, hic labor est.