The Second Epistle of John, often referred to as Second John and often written 2 John, is a book of the New Testament attributed to John the Evangelist, traditionally thought to be the author of the Gospel of John and the other two epistles of John.
The language of this epistle is remarkably similar to 3 John. It is therefore suggested by a few that a single author composed both of these letters. The traditional view contends that all the letters are by the hand of John the Apostle, and the linguistic structure, special vocabulary, and polemical issues all lend toward this theory.
Also significant is the clear warning against paying heed to those who say that Jesus was not a flesh-and-blood figure: “For many deceivers are entered into the world, who confess not that Jesus Christ has come in the flesh.” This establishes that, from the time the epistle was first written, there were those who had docetic Christologies, believing that the human person of Jesus was actually pure spirit
Book 2 John: