7 entered. This means, literally, “gone forth” into the world, evidently from the domain of Satan, seeking to undermine and destroy any true church.
7 in the flesh. This is the specific test by which to distinguish true teachers from false teachers (I John 4:1-3). Actually the verb “is come” could be rendered “is coming.” That is, Jesus Christ is coming back to this world, and it will again be “in the flesh,” but His body is now made of glorified and immortal flesh.
7 deceiver and an antichrist. Literally, “the deceiver and the antichrist.” This is indeed the doctrine taught by Satan and his coming Antichrist, but already there are “many antichrists” (I John 2:18), as well as “many deceivers” that have “entered into the world.”
9 transgresseth. This means, “goes beyond,” trying to put esoteric extrapolations of a pseudo-spiritual nature on the plain teachings of Christ and His Word.
9 doctrine. The “doctrine” of Christ (which word actually is “teachings” in the Greek) must include all the teachings of Christ, everything He said and did, covering all the Scripture and all His purposes.