1 John 1:1 begins John’s first church letter with a statement of his personal witness of Jesus on Earth. 

1 John 1:2-4 proclaims that the eternal life, which was with the Father, has been revealed in a tangible and personal way, witnessed directly by those who encountered Him. They explain that this testimony is shared so that others may enter into true fellowship with both the Father and His Son. The ultimate purpose of this proclamation is the fullness of shared joy that flows from that fellowship.