That God only came into Jesus temporarily between his baptism and crucifixion. God speed is a partaker of his evil. This is a parallel type passage. He is antichrist , that denieth the Father and the Son. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him.
Deceivers are liars.
So run, that ye may obtain. These are his doctrines. During the early church period, the gospel was taken place to place by traveling evangelists and teachers. Homes where used by these missionaries to preach the word and to receive provisions for their journey. Second John urges discernment in supporting traveling teachers or heresy could be propagated.