1 John 5:10

He that believeth on the Son of God, with such a faith, hath the testimony in himself Namely, knows by experience, that what God hath testified concerning his Son, and salvation in and through him, is indeed true, being already saved by him from the guilt and power of sin, into the favour and image of God, and a state of communion with him. He knows by experience, that Jesus is the Son of God in such a sense as to be an all- sufficient Saviour, and that he came by cleansing water, and by atoning blood, having received justification through the latter, and sanctification through the former. Or, which is to the same purpose, he hath received the testimony mentioned 1 John 5:11. For, as in that verse, “the witness, by a usual metonymy, is put for the thing witnessed, and the thing witnessed being, that God hath given us eternal life through his Son, he who believeth on the Son of God, may justly be said to have eternal life, the thing witnessed, in himself; because, by his faith on the Son, being begotten of God, he hath, in the dispositions of God's children communicated to him, eternal life begun in him; which is both a pledge and a proof that God, in due time, will completely bestow on him eternal life through his Son.” Macknight. Add to the above, that eternal life is begun in him, and that God will, in due time, bestow on him the full enjoyment of it, he hath the testimony of the Father, Son, and Holy Ghost; the Father having lifted up the light of his countenance upon him, and thereby put joy and gladness into his heart, Psalms 4:6; Christ dwelling in his heart by faith, and being precious to his soul, Eph 3:17; 1 Peter 2:7; and the Holy Ghost, as a Spirit of adoption, witnessing with his spirit that he is a child of God, and producing in him love, joy, and peace, Romans 8:15; Galatians 5:22. And he hath the witness of the Spirit in himself, mentioned 1 John 5:8, or of the inspired writings, which bear witness to the genuineness of his religion, and his title to eternal life, and which are the food of his soul, the sweetness of which he tastes, and is nourished thereby; tastes the good word of God, Hebrews 6:5. He hath the witness of the water in himself, having been baptized with water, and had the sign, and also the thing signified thereby, the regenerating grace of God; and the witness of the blood, having received the atonement, and pardon through it, and taking all opportunities of receiving the Lord's supper, when the bread that he breaks is to him the communion of Christ's body; and the wine which he drinks, the communion of his blood; and he feeds on Christ in his heart by faith, with thanksgiving. On the other hand, he that believeth not God As to his testimony concerning Christ, when at his baptism, and on the mount of transfiguration, he declared him to be his Son by a voice from heaven; and when, after his death, he demonstrated him to be his Son by raising him from the dead; hath made him a liar That is, by refusing to believe these testimonies, he hath acted as if he judged God to be a liar, or false witness. Some MSS. and ancient versions, particularly the Vulgate, instead of He that believeth not God, have, He that believeth not the Son; which Grotius and Bengelius think the true reading. But, like most of the various readings, this makes no alteration in the sense of the passage.