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.
2:19. They 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.
2:20. But 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.
2:21. I 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.
2:22. Who is a liar, but he who denieth that Jesus is the Christ? This is Antichrist, who denieth the Father and the Son.
2:23. Whosoever denieth the Son, the same hath not the Father. He that confesseth the Son hath the Father also.
2:24. As for you, let that which you have heard from the beginning abide in you. If that abide in you, which you have heard from the beginning, you also shall abide in the Son and in the Father.
2:25. And this is the promise which he hath promised us, life everlasting.