The Advocate is Jesus Christ the righteous. That is very significant. More than that: "And He is the propitiation." Notice the double ground. First, the advocacy is founded upon His being the righteous One. We had no righteousness; He is the righteous One, and from God made to us, not only wisdom, but righteousness. Second, He is the propitiation for our sins, and He was sent by God the Father for this very end. He bore all that was necessary to expiate our sins in divine judgment once for all. But as Advocate He meets the Christian's sin that interrupted his enjoyment of communion with the Father and with the Son.
Oh, how sad, beloved brethren, when we slight that communion, so as not to feel these interruptions, to which any levity of word or deed in our folly exposes us! But "we have an Advocate with the Father, Jesus Christ the righteous." [231