Augustine of Hippo, on 1John 4:3

“And every spirit that dissolveth Jesus, is not of God: and this is Antichrist, of whom you have heard that he cometh, and he is now already in the world.”

“"And every spirit, qui solvit Christum, which does away with Christ that He came in the flesh, is not of God." A doing away in deeds is meant. What has he shown thee? "That denieth:" in that he saith, "doeth away" (or, "unmaketh"). He came to gather in one, thou comest to unmake. Thou wouldest pull Christ's members asunder. How can it be said that thou deniest not that Christ is come in the flesh, who rendest asunder the Church of God which He hath gathered together? Therefore thou goest against Christ; thou art an antichrist. Be thou within, or be thou without, thou art an antichrist: only, when thou art within, thou art hidden; when thou art without, thou art made manifest. Thou unmakest Jesus and deniest that He came in the flesh; thou art not of God. Therefore He saith in the Gospel: "Whoso shall break one of these least commandments, and shall teach so, shall be called least in the kingdom of heaven." What is this breaking? What this teaching? A breaking in the deeds and a teaching as it were in words. "Thou that preachest men should not steal, dost thou steal?" Therefore he that steals breaks or undoes the commandment in his deed, and as it were teaches so: "he shall be called least in the kingdom of heaven," i.e. in the Church of this present time. Of him it is said, "What they say do ye; but what they do, that do not ye."”

Imported from an open dataset — not yet checked against the printed edition.