John 6:55,56

This is further shown in John 6:55-56. ἡ γὰρ σάρξ μου ἀληθῶς [better ἀληθής] ἐστι βρῶσις, “For my flesh is a genuine food and my blood is a genuine drink”; with an implied contrast to those things with which men ordinarily endeavour to satisfy themselves. The satisfying, genuine character of Christ as the bread consists especially in this, that ὁ τρώγων … ἐν ἐμοὶ μένει κἀγὼ ἐν αὐτῷ. He becomes as truly assimilated to the life of the individual as the nourishing elements in food enter into the substance of the body. The believer abides in Christ as finding his life in Him (Galatians 2:20); and Christ abides in the believer, continually imparting to him what constitutes spiritual life. For in Christ man reaches the source of all life in the Father (John 6:57), καθὼς ἀπέστειλέ με ὁ ζῶν πατὴρ … διʼ ἐμέ. The living Father has sent Christ forth as the bearer of life. He lives διὰ τὸν πατέρα, not equivalent to διὰ τοῦ πατρός, through or by means of the Father, but “because of,” or “by reason of the Father”. The Father is the cause of my life; I live because the Father lives. [Beza quotes from the Plutus of Aristoph., 470, the declaration of Penia that μόνην Ἀγαθῶν ἁπάντων οὖσαν αἰτίαν ἐμὲ Ὑμῖν, διʼ ἐμέ τε ζῶντας ὑμᾶς.] The Father is the absolute source of life; the Son is the bearer of that life to the world; cf. John 5:26, where the same dependence of the Son on the Father for life is expressed. The second member of the comparison, introduced by καί (see Winer, p. 548; and the Nic. Ethics, passim), is not, as Chrys. and Euthymius suggest, κἀγὼ ζῶ, but καὶ ὁ τρώγων με, κἀκεῖνος ζήσεται (better ζῆσει) διʼ ἐμέ. (For the form of the sentence cf. John 10:14.) Every one that eateth Christ will by that connection participate in the life of God.