Teach nothing new, but instill into all men's breasts those things which the Fathers of revered memory have with harmony of statement taught... Preach nothing else than what we received from our forefathers... Accordingly, both in the rule of faith and in the observance of discipline, let the standard of antiquity be maintained throughout.
Pope Leo ILet no one be ashamed of the cross by which Christ has redeemed the world. None of us must be afraid to suffer for the sake of justice or doubt the fulfillment of the promises, for it is through toil that we come to rest and through death that we pass to life.
Pope Leo INo one, however weak, is denied a share in the victory of the cross. No one is beyond the help of the prayer of Christ.
Pope Leo IThe faith by which we live shall never vary in any age . . . for one is the faith which sanctifies the Just of all ages.
Pope Leo I