Charles Spurgeon Commentary John 6:56-58

"He that eateth my flesh and drinketh my blood abideth in me, and I in him. As the living Father sent me, and I live because of the Father; so he that eateth me, he also shall live because of me. This is the bread which came down out of heaven: not as the fathers ate, and died; he that eateth this bread shall live for ever." — John 6:56-58 (ASV)

He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him. As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me. This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.

The Saviour goes over the same ground several times; there is a variety in his utterances, but in essence the meaning is the same. He wants to get it into our minds that we are to live upon him—that He, not self, He, not works, He, not our feelings, is the real food of the soul, by which that soul acquires and retains immortal life.