(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);
and was manifested unto us: As he ends this parenthetical statement, John continues to hammer away at the fact that Jesus was revealed to the apostles in a very discernible fashion. This eternal Christ was actually made visible to them in a form they could see and touch, proving the incarnation of Jesus by the eyewitness testimony of His apostles.