Our lot would be cast with beasts, who do not have the use of reason. Ours would be an even worse lot, for we do have the use of reason and by abusing it (which, unfortunately, often happens) we can sink into a state lower than that of beasts. Like Cain, we would commit a terrible crime and stain the earth with our brother's blood.
Si haec dottrina, si haec spes solacii plena ex hominum animis evellitur, tota causa vivendi labitur; cupidines, dissensiones ac discidia necessario erumpunt e penetralibus nostris, nullo valido freno compescenda; non oliva pacis mentibus splendet, sed discordiarum faces flammescunt; sors nostra bestiarum sorti, quae sunt rationis expertes, quasi exaequatur; quin immo deterior est, quandoquidem, cum nos simus ratiocinandi vi praediti; ea abutentes possumus ad peiora eniti ac prolabi, quod saepius, pro dolor, evenit; atque, ut iam Cain, fraterno effuso sanguine gravique patrato crimine foedare terram.vatican.va vatican.va