Next John moved on to his second purpose. He wrote to encourage his readers to resist the false teachers who were distorting the truth and deceiving some of the believers. [source][source][source]
"The presbyter"s attention now moves from the existence of true belief inside the Johannine community, which gives him great joy ( 2 John 1:4), to the dangers presented to it through the espousal of false belief by deceivers who have "defected into the world." Earlier, the writer has spoken of Christian truth and love; in the remainder of2John the emphasis inevitably falls on the need for truth in contrast to error. But the two sections interlock. Departure from the truth results in a failure of love. Thus the dark description of heretical secession and its consequences ( 2 John 1:7-11) forms the basis of John"s warm appeal for love and unity ( 2 John 1:4-6)." [1][source]