(and the life was revealed, and we have seen, and testify, and declare to you the life, the eternal life, which was with the Father, and was revealed to us);
The second reason why he wrote this epistle is in chapter 2, verse 1 John 1:1 . "These things write we unto you, that ye sin not." And so, the purpose of this epistle is to bring to you a life of victory over sin, to give you power over sin.