Analyticae Quaestiones & Responsiones de pane vitae

5. That we must flee from the two errors of the Capernaites, of which one was concerning the manner of eating: the other concerning the thing to be eaten and its giver.
As Nicodemus, not yet grasping the mystery of Regeneration, because he had wrongly collected from the saying of Christ Jesus, which he did not understand, that a man must be born again bodily, not spiritually, he burst out into this ridiculous utterance: How can a man be born who is old? can he enter a second time into his mother's womb and be born? But he received the response that a man must be born again to eternal life Spiritually, not Bodily, saving [him]. That which is born of the Spirit, is Spirit. John 3:4, 6.

So the Capernaites, when they had not attained the meaning of Christ’s words, concerning the perception of His Flesh, feigned a Chimera about the entry of Christ’s flesh into the mouths of men, and about a certain oral eating of that same flesh, and the drinking of that blood: and they moved a profane question: How can this man give us (his) flesh to eat? But against this monster Christ opposed the pious doctrine, concerning spiritual eating, which occurs through faith: when He said: He who comes to me shall not hunger, and he who believes in me shall never thirst. It is the Spirit that vivifies: the Flesh profits nothing. John 6:35, 63. And so that He might remove every scruple about that oral and bodily eating from their minds, He made mention also of His ascension into heaven, which was going to bear this least of all, that the Capernaites on earth should eat His flesh orally. verse 62. What if therefore you should see the Son of man ascending to where He was before?

Just as the Pharisees also complained about the Lord Jesus, for forgiving sins, because they did not acknowledge His Deity: Why does this man speak blasphemies in this way? who can forgive sins except God alone? Mark 2:7. Christ the Lord refuted them by divine benefit.

So when the Capernaites denied that vivifying flesh could be given by the Lord Jesus: because it is the Son of God who vivifies: this imagination