18Little children, it is the last hour: and as you have heard that Antichrist cometh, even now there are become many Antichrists: whereby we know that it is the last hour. It is the last hour... That is, it is the last age of the world. Many Antichrists;... that is, many heretics, enemies of Christ and his church, and forerunners of the great Antichrist.
19They went out from us but they were not of us. For if they had been of us, they would no doubt have remained with us: but that they may be manifest, that they are not all of us. They were not of us... That is, they were not solid, steadfast, genuine Christians: otherwise they would have remained in the church.
20But you have the unction from the Holy One and know all things. The unction from the Holy One... That is, grace and wisdom from the Holy Ghost. Know all things... The true children of God's church, remaining in unity, under the guidance of their lawful pastors, partake of the grace of the Holy Ghost, promised to the church and her pastors; and have in the church all necessary knowledge and instruction; so as to have no need to seek it elsewhere, since it can be only found in that society of which they are members.
21I have not written to you as to them that know not the truth, but as to them that know it: and that no lie is of the truth.
Commentary
DoctrinalThe eternal Word, consubstantial with God, becomes flesh to generate true sonship by grace, and the Spirit’s anointing preserves that truth in a persevering Church against antichristly departures.