This letter was composed sometime around 85-90 A.D. with the intent to remove doubts and resssure young Christians about who Jesus was. John is the same author who wrote the Gospel of John…and he was older now and perhaps the only surviving apostle at this time. This is the same John that would walk & talk with Jesus, watch Jesus die, met Jesus after He rose from the dead and saw Jesus go up to Heaven. It’s safe to say that John knew who the Lord was…and that love would convey itself in this letter. John also wrote this letter to counter false teachers.