"The life apeared"

1John 1:1-4, "That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked at and our hands have touched —this we proclaim concerning the Word of life. The life appeared; we have seen it and testify to it, and we proclaim to you the eternal life, which was with the Father and has appeared to us. We proclaim to you what we have seen and heard, so that you also may have fellowship with us. And our fellowship is with the Father and with his Son, Jesus Christ. We write this to make our joy complete."

Jesus is "the eternal life". He didn't begin, nor was began, he "was from the beginning", that means from eternity "with the Father", that means he was of the same divine nature as the Father. And John and the apostles "have heard...seen with their eyes...have looked at and...(their) hands have touched, the living historical Jesus, or the Jesus of history. According to the Holy Scriptures there are more than 500 witnesses that have seen Jesus alive after his resurrection. He was not a spirit, legend or a myth...he was God's Son, the Word of life, and he lived with us for about 33 years, as a man. Jesus Christ, the God-man - his life, death and resurrection is what the apostles proclaimed, and this is what we proclaim, those who have put their trust in him, for salvation.

The disciples of Jesus and over 500 witnesses testified to this! "WE HAVE SEEN WITH OUR EYES" "the Word of life", Jesus Christ, God's own Son. And no one can disprove that fact for them. And we also believe in Jesus Christ, based on their testimony recorded in the Holy Scripture! ! And so, we may share in the joy they have, the joy that comes from the fellowship with the Father and the Son. And we have entered that fellowship when we have put our faith in Jesus Christ's substitutionary death for us, sinners.

So, simply put, all those that have heard, believed and obeyed Jesus Christ in faith and repentance, have a mutual fellowship of love between us believers, because we have fellowship "with the Father and with his Son, Jesus Christ". There is no life outside of Jesus Christ, because he is "the Word of life", he gives life to all. And only when there is mutual fellowship between believers, and with God the Father and his Son, only than there is "joy complete" - a genuine experience of God's presence.