|The Doctor of Grace, St. Augustine of|
Hippo, 354-430 AD
Moreover, a little after He says, "Murmur not among yourselves. No one can come to me, except the Father which has sent me draw him; and I will raise him up at the last day. It is written in the prophets, And they shall be all teachable of God. Every man that has heard of the Father, and has learned, comes unto me." What is the meaning of, "Every man that has heard from the Father, and has learned, comes unto me," except that there is none who hears from the Father, and learns, who comes not to me? For if every one who has heard from the Father, and has learned, comes, certainly every one who does not come has not heard from the Father; for if he had heard and learned, he would come. For no one has heard and learned, and has not come; but every one, as the Truth declares, who has heard from the Father, and has learned, comes.
Far removed from the senses of the flesh is this teaching in which the Father is heard, and teaches to come to the Son. Engaged herein is also the Son Himself, because He is His Word by which He thus teaches; and He does not do this through the ear of the flesh, but of the heart. Herein engaged, also, at the same time, is the Spirit of the Father and of the Son; and He, too, teaches, and does not teach separately, since we have learned that the workings of the Trinity are inseparable. And that is certainly the same Holy Spirit of whom the apostle says, "We, however, having the same Spirit of faith" (2 Corinthians 4:13). But this is especially attributed to the Father, for the reason that of Him is begotten the Only Begotten, and from Him proceeds the Holy Spirit, of which it would be tedious to argue more elaborately; and I think that my work in fifteen books on the Trinity which God is, has already reached you. Very far removed, I say, from the senses of the flesh is this instruction wherein God is heard and teaches. We see that many come to the Son because we see that many believe in Christ, but when and how they have heard this from the Father, and have learned, we see not. It is true that that grace is exceedingly secret, but who doubts that it is grace?
This grace, therefore, which is hiddenly bestowed in human hearts by the Divine gift, is rejected by no hard heart, because it is given for the sake of first taking away the hardness of the heart. When, therefore, the Father is heard within, and teaches, so that a man comes to the Son, He takes away the heart of stone and gives a heart of flesh, as in the declaration of the prophet He has promised. Because He thus makes them children and vessels of mercy which He has prepared for glory.
~ On Predestination of the Saints (Book I), Chapter 13.