that which we have seen and heard we declare to you, that you also may have fellowship with us. Yes, and our fellowship is with the Father, and with his Son, Jesus Christ.
And then the third reason why he wrote the epistle is in chapter 5, verse 1Jo 1:13 . "These things have I written unto you that believe in the name of the Son of God, that you may know that you have eternal life." Written to believers for the purpose of bringing them assurance of their salvation, "That you may know that you have eternal life." So, to bring you fullness of joy, freedom from sin, and assurance of eternal life, those are the purposes for which John wrote this epistle.