My little children, I write these things to you so that you may not sin. If anyone sins, we have a Counselor{Greek Parakleton: Counselor, Helper, Intercessor, Advocate, and Comfortor.} with the Father, Jesus Christ, the righteous.
But the two names, by which he afterwards signalizes Christ, properly belong to the subject of this passage. He calls him just and a propitiation. It is necessary for him to be both, that he might sustain the office and person of an Advocate; for who that is a sinner could reconcile God to us? For we are excluded from access to him, because no one is pure and free from sin. Hence no one is fit to be a high priest, except he is innocent and separated from sinners, as it is also declared in Hebrews 7:26. Propitiation is added, because no one is fit to be a high priest without a sacrifice. Hence, under the Law, no priest entered the sanctuary without blood; and a sacrifice, as a usual seal, was wont, according to God’s appointment, to accompany prayers. By this symbol it was God’s design to shew, that whosoever obtains favor for us, must be furnished with a sacrifice; for when God is offended, in order to pacify him a satisfaction is required. It hence follows, that all the saints who have ever been and shall be, have need of an advocate, and that no one except Christ is equal to undertake this office. And doubtless John ascribed these two things to Christ, to shew that he is the only true advocate. 