But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.
7 But if we walk in the light. He now says, that the proof of our union with God is certain, if we are conformable to him; not that purity of life conciliates us to God, as the prior cause; but the Apostle means, that our union with God is made evident by the effect, that is, when his purity shines forth in us.
The apostle, having declared the truth and dignity of the author of the gospel, brings a message or report from him, from which a just conclusion is to be drawn for the consideration and conviction of the professors of religion, or professed entertainers of this glorious gospel. I.
Commenting on 1 John 1:5-7
But if we walk in the light,.... Are persons enlightened by the Spirit of God, so as to have a true sight and sense of sin, to know Christ, and the way of salvation by him; and are children of the light, and are going on and increasing in spiritual light and knowledge; walk on in Christ, the light, by faith, and in the light...