And John sweeps in the whole crowd of the world in the way he puts it here. Listen: "that you may believe that Jesus is _the Christ_." That was for the Jew peculiarly in the first instance. The Jew had been taught through generations that there was One coming who was God's chosen One for the Hebrew nation. He was the _Anointed One_. The Hebrew said _Messiah_. The Greek said _Christ_. Both mean the same, the One chosen of God, anointed by Him as the King and Leader of His chosen people, and through them of all the race. Listen further: "that Jesus is _the Son of God." That_ is for all of us, Jew and foreigner, insider and outsider. This Jesus is in a distinctive sense _the_ Son of God, the only begotten Son. This pure loving pleading wooing suffering dying rising-again Jesus, this is the only begotten Son of the Father. All there is in a Father comes to, and is in, an only begotten son. This is God Himself coming to us in His Son. Once let this sift into thought and heart, then who would _not_ believe, _and_ trust, _and_ love, _and_ fall on his face in the utter devotion of a voluntary slave before such a God! And so believing, trusting, loving, touching, His life flows in and fills up and floods out. We have it _now_. That word _eternal_, used so often by John with the word _life_, is not a mere _length_ word. It is not a calendar word. It tells the sort of life, the quality of life, that comes in through the opening door of our believing. This is John's back-door key, but it lets you clear in through the whole house. Then there is _the side-door key_. It hangs at the side, a bit towards the back. It is in the Thursday night talk, as we commonly call it, that last heart-talk with the inner group on the betrayal night. It is in chapter sixteen, verse twenty-eight: "_I came out from the Father, and am come into the world: again, I leave the world, and go unto the Father_." Run through this Gospel with that fresh in your mind, and it is perfectly fascinating to find how much like a magnet it is, picking out to itself so many bits from the Master's lips that fit exactly into it. Jesus' constant thought was that He used to be with the Father; He came down on an errand to the earth. By and by when the errand was done He would go back home again. This sentence becomes a simple, exact, comprehensive outline of the entire Gospel. Notice: "_I came out from the Father_": that is chapter one, verses one to eighteen. There Jesus is seen coming down from His Father's own presence. Then chapter one, verse nineteen through to the close of the twelfth chapter is fully described and covered by the next clause, "_and am come into the world_." Here He is seen in the world, in the midst of its crowds and contentions and oppositions.