Mark 6:13

(ubi sup.) Wherefore it is evident from the Apostles themselves, that it is an ancient custom of the holy Church that persons possessed or afflicted with any disease whatever, should be anointed with oil consecrated by priestly blessing.

But, moreover, the very interrogation which is put in baptism is a witness of the truth. For when we say, "Dost thou believe in eternal life and remission of sins through the holy Church? "we mean that remission of sins is not granted except in the Church, and that among heretics, where there is no Church, sins cannot be put away. Therefore they who assert that heretics can baptize, must either change the interrogation or maintain the truth; unless indeed they attribute a church also to those who, they contend, have baptism. It is also necessary that he should be anointed who is baptized; so that, having received the chrism, that is, the anointing, he may be anointed of God, and have in him the grace of Christ. Further, it is the Eucharist whence the baptized are anointed with the oil sanctified on the altar. But he cannot sanctify the creature of oil, who has neither an altar nor a church; whence also there can be no spiritual anointing among heretics, since it is manifest that the oil cannot be sanctified nor the Eucharist celebrated at all among them. But we ought to know and remember that it is written, "Let not the oil of a sinner anoint my head," which the Holy Spirit before forewarned in the Psalms, lest any one going out of the way and wandering from the path of truth should be anointed by heretics and adversaries of Christ. Besides, what prayer can a priest who is impious and a sinner offer for a baptized person? since it is written, "God heareth not a sinner; but if any man be a worshipper of God, and doeth His will, him He heareth." Who, moreover, can give what he himself has not? or how can he discharge spiritual functions who himself has lost the Holy Spirit? And therefore he must be baptized and renewed who comes untrained to the Church, that he may be sanctified within by those who are holy, since it is written, "Be ye holy, for I am holy, saith the Lord." So that he who has been seduced into error, and baptized outside of the Church, should lay aside even this very thing in the true and ecclesiastical baptism, viz., that he a man coming to God, while he seeks for a priest, fell by the deceit of error upon a profane one.

Hence also miracles were added to the holy preachers, so that the power displayed might give faith to their words, and that those who preached new things might do new things. When the world was flourishing, when the human race was increasing, when the flesh was subsisting long in this life, when the abundance of things was overflowing, who upon hearing would believe that there was another life? Who would prefer invisible things to visible things? But when the sick were returning to health, when the dead were rising to life, when lepers were receiving cleanliness of flesh, when demoniacs were snatched from the power of unclean spirits, with so many visible miracles performed, who would not believe what he heard about invisible things? For visible miracles shine forth for this purpose: that they may draw the hearts of those who see them to faith in invisible things, so that through what is done wondrously on the outside, what is within may be perceived to be far more wondrous. Hence now also, when the number of the faithful has increased, there are many within the holy Church who hold to a life of virtues but do not have the signs of virtues, because a miracle is shown outwardly in vain if what it should work inwardly is lacking. For according to the voice of the Teacher of the Gentiles: "Tongues are for a sign not to believers, but to unbelievers." Hence also that same distinguished preacher, amidst the words of his preaching, raised by praying, in the sight of all the unbelievers, Eutychus who had fallen asleep and fallen from the window and was completely extinguished from life. Coming to Malta, and knowing the island was full of unbelievers, he healed by praying the father of Publius who was afflicted with dysentery and fevers. But his companion on his journey and helper in his holy preaching, Timothy, who was growing weak from a stomach ailment, he does not cure by a word but restores by the art of medicine, saying: "Use a little wine, for your stomach and your frequent infirmities." Why then does he who saves an unbelieving sick person with a single prayer not also strengthen his sick companion with prayer? Because surely that one who was not inwardly alive needed to be healed outwardly through a miracle, so that through what the external power displayed, the internal virtue might animate him to life. But to the faithful sick companion, outward signs…