John 3:36

"Is it then enough," saith one, "to believe on the Son, that one may have eternal life?" By no means. And hear Christ Himself declaring this, and saying, "Not every one that saith unto Me, Lord, Lord, shall enter into the kingdom of heaven"; and the blasphemy against the Spirit is enough of itself to cast a man into hell. But why speak I of a portion of doctrine? Though a man believe rightly on the Father, the Son, and the Holy Ghost, yet if he lead not a right life, his faith will avail nothing towards his salvation. Therefore when He saith, "This is life eternal, that they may know Thee the only true God," let us not suppose that the knowledge spoken of is sufficient for our salvation; we need besides this a most exact life and conversation. Since though he has said here, "He that believeth on the Son hath eternal life," and in the same place something even stronger, (for he weaves his discourse not of blessings only, but of their contraries also, speaking thus: "He that believeth not the Son shall not see life, but the wrath of God abideth on him";) yet not even from this do we assert that faith alone is sufficient to salvation. And the directions for living given in many places of the Gospels show this. Therefore he did not say, "This by itself is eternal life," nor, "He that doth but believe on the Son hath eternal life," but by both expressions he declared this, that the thing doth contain life, yet that if a right conversation follow not, there will follow a heavy punishment. And he did not say, "awaiteth him," but, "abideth on him," that is, "shall never remove from him." For that thou mayest not think that the "shall not see life," is a temporary death, but mayest believe that the punishment is continual, he hath put this expression to show that it rests upon him continually.

Carnal thought does not apprehend what I say: let it defer understanding, and begin by faith; let it hear what follows: "He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him." He has not said, The wrath of God cometh to him; but, "The wrath of God abideth on him." All that are born mortals have the wrath of God with them. What wrath of God? That wrath which Adam first received. For if the first man sinned, and heard the sentence, "Thou shalt die the death," he became mortal, and we began to be born mortal; and we have been born with the wrath of God. From this stock came the Son, not having sin, and He was clothed with flesh and mortality. If He partook with us of the wrath of God, are we slow to partake with Him the grace of God? He, then, that will not believe the Son, on the same "the wrath of God abideth." What wrath of God? That of which the apostle says, "We also were by nature the children of wrath, even as the rest." All are therefore children of wrath, because coming of the curse of death. Believe on Christ, for thee made mortal, that thou mayest receive Him, the immortal; and when thou shalt have received His immortality, thou shalt no longer be mortal. He lived, thou wast dead; He died that thou shouldst live. He has brought us the grace of God, and has taken away the wrath of God. God has conquered death, lest death should conquer man.

(Tr. xiv. c. 13) Nor does He say, The wrath of God cometh to him, but, abideth on him. For all who are born, are under the wrath of God, which the first Adam incurred. The Son of God came without sin, and was clothed with mortality: He died that thou mightest live. Whosoever then will not believe on the Son, on him abideth the wrath of God, of which the Apostle speaks, We were by nature the children of wrath. (Eph. 2:3)

We must understand here not a faith in words only, but a faith which is developed in works.

And because all things are in His hand, the life everlasting is too: and therefore it follows, He that believeth on the Son hath everlasting life.