Augustine of Hippo : If we lament the many sheep that are straying outside, woe to those whose shoulders and sides and horns have brought it about. It is only strong sheep who would do this. Who are the strong? Those who rely on their own righteousness. None but those who called themselves just divided the sheep and drove them outside. Shoulders bold at shoving, because they do not bear God's burden; evil sides, conspiracies of friends, companions in obstinacy; horns lifted up, high and mighty pride. Shove with sides and shoulders, flail with your horns, drive outside what you have not bought. Certainly this is your whole case, that you are just and others are unjust, and it was unfitting that the just should remain with the unjust, unfitting, that is to say, that the corn should remain among the weeds, unfitting that the sheep should feed among the goats until the shepherd should come who would make no mistake in separating them. — SERMON 47:16