In this chapter the apostle gives a summary of the Gospel, and the evidence of it, and from thence presses to a holy life and conversation, The sum of the Gospel is Jesus Christ, who is described both as God and man; his deity is expressed by being that which was from the beginning, the Word of life, life, and eternal life; his humanity by being the life manifested in the flesh, of which the apostles had full evidence by the several senses of seeing, hearing, and handling, and so were capable of bearing witness to the truth thereof, Jo1 1:1. And the ends had in view in giving this summary, evidence, and testimony, were, that the saints wrote unto might have fellowship with the apostles, whose fellowship was with the Father, and his Son Jesus Christ, and that their joy on hearing these things might be full, Jo1 1:3. And the amount of the message declared by them was, that God is light, or a pure and holy Being, and that there is no darkness of sin, or unholiness in him; wherefore all such that pretend to communion with him, and live a sinful course of life, are liars; only such have fellowship with him, and with his Son, whose blood cleanses them from all sin, who live holy lives and conversations, Jo1 1:5, not, that it is to be expected that men should be clear of the being of sin in this life, only that they should, as often as they sin, be humbled for it, and confess it before God, who will forgive them, and cleanse them from all unrighteousness; but as for those who affirm they have no sin in them, or any done by them, they are self-deceivers, the truth of grace is not in them, nor the word of God, and they make him a liar, Jo1 1:8.