1 John 2:23

Now this is a remarkable sentence, and ought to be reckoned among the first axioms of our religion. yea, when we have confessed that there is one true God, this second article ought necessarily to be added, that he is no other but he who is made known in Christ. The Apostle does not here treat distinctly of the unity of essence. It is, indeed, certain, that the Son cannot be disunited from the Father, for he is of the same essence, ( ὁμοούσιος;) but another thing is spoken of here, that is, that the Father, who is invisible, has revealed himself only in his Son. Hence he is called the image of the Father, (Hebrews 1:3,) because he sets forth and exhibits to us all that is necessary to be known of the Father. For the naked majesty of God would, by its immense brightness, ever dazzle our eyes; it is therefore necessary for us to look on Christ. This is to come to the light, which is justly said to be otherwise inaccessible.

I say, again, that there is not here a distinct discussion respecting the eternal essence of Christ, which he has in common with the Father. This passage is, indeed, abundantly sufficient to prove it: but John calls us to this practical part of faith, that as God has given himself to us to be enjoyed only in Christ, he is elsewhere sought for in vain; or (if any one prefers what is clearer) that as in Christ dwells all the fullness of the Deity, there is no God apart from him. It hence follows, that Turks, Jews, and such as are like them, have a mere idol and not the true God. For by whatever titles they may honor the God whom they worship, still, as they reject him without whom they cannot come to God, and in whom God has really manifested himself to us, what have they but some creature or fiction of their own? They may flatter themselves as much as they please, with their own speculations, who, without Christ, philosophize on divine things; it is still certain that they do nothing but rave and rant, because, as Paul says, they hold not the Head. (Colossians 2:19.) It is obvious, hence, to conclude how necessary is the knowledge of Christ.

Many copies have the opposite sentence, “He who confesses the Son,” etc. But as I think that a note by some copyist has crept into the text, I hesitated not to omit it. (72) But if its insertion be approved, the meaning would be, that there is no right confession of God except the Father be acknowledged in the Son.

Were any one to object and say, that many of the ancients thought rightly of God, to whom Christ was not known: I allow that the knowledge of Christ has not been always so explicitly revealed, nevertheless, I contend that it has been always true, that as the light of the sun comes to us by its rays, so the knowledge of God has been communicated through Christ.