John 17:3

Verse 3. This is life everlasting; that is, the way to life everlasting, that they may know thee, the only true God, and Jesus Christ, whom thou hast sent [2]. The Arians, from these words, pretended that the Father only is the true God. Saint Augustine and divers others answer, that the sense and construction is, that they may know thee, and also Jesus Christ thy Son, whom thou hast sent to be the only true God. We may also expound them with Saint John Chrysostom and others, so that the Father is here called the only true God, not to exclude the Son, and the Holy Ghost, who are the same one true God with the Father; but only to exclude the false gods of the Gentiles. Let the Socinians take notice, that (1 John 5:20) the Son of God, Jesus Christ, is expressly called the true God, even with the Greek article, upon which they commonly lay so much stress. Witham.—Life everlasting. Both the life of glory in heaven, and of grace here, consisteth in the knowledge of God; the former in perfect vision, the latter in faith working by charity. For knowledge of God, without keeping his commandments, is not true knowledge, but unprofitable knowledge. 1 John 2.