II John
The letter is addressed to “the elect lady and her children” (1:1, 4-5), and it is a clear reference to the church at large.  As in his first letter, John appears to be desire to warn against those who say that Christ did NOT come in the flesh (Gnosticism).

Here is an outline of II John:

I.                    Prologue and greeting (1:1-3)

II.                  Commendation for walking in the truth (1:4)

III.                Commandment to continue to love one another (1:5-6)

IV.                Cautions and instructions against false teachers (1:7-11)

V.                  Concluding remarks and final greetings (1:12-13)