Meminisse Iuvat §19

¹⁹ They should recall and meditate upon the wise words of Saint Cyprian, bishop and martyr: "The Lord spoke thus to Peter: I say to thee, thou art Peter, and upon this rock I will build my church . . . On Peter alone He raised His Church. . . We must all resolutely preserve and defend this unity, but especially we bishops who govern the Church. . .