"Without priests the Church would not be able to live that fundamental obedience which is at the very heart of her existence and her mission in history, an obedience in response to the command of Christ: "Go therefore and make disciples of all nations" (Mt. 28:19) and "Do this in remembrance of me" (Lk. 22:19; cf. 1 Cor. 11.24), i.e:, an obedience to the command to announce the Gospel and to renew daily the sacrifice of the giving of his body and the shedding of his blood for the life of the world."
~ Pope John Paul II