Matthew Poole and continuators on John 6:63

63 It is the Spirit that quickneth , the flesh profiteth nothing : the words that I speak unto you, they are spirit, and they are life b.

As it is not the Bread or Flesh that a man eateth for the sustenance of his Animal or Natural Life, that doth the main work, but the Soul of a man within him; which putteth forth its Vertues and Powers in causing the Digestion, Concoction, and alteration of it; without which it nourisheth not the Body:

So the Flesh of Christ eaten Carnally, can be of no profit for the Nourishment of the Soul; nor can the Flesh of Christ considered alone, or by any Vertue in it, profit, it onely profiteth by Vertue of the Divine Nature, which being Personally United to the Humane Nature, addeth all the Vertue and Merit to the Sufferings and Actions of the Humane Nature; so as the Humane Nature of Christ hath all its quickning Vertue from the Divine Nature. It is not therefore the Carnal eating of my Flesh that I intended, that is a very gross conception of yours; nor can any such thing as that do you good: But the words that I speak to you they are Spiritual, and such, by the belief of which you may obtain a Spiritual and Eternal Life: For by believing those words, and obeying them, you shall come to believe in me, which is that eating my Flesh, and drinking my Blood which I intended; not any Corporeal or Carnal eating.

Marginal references: 2 Cor. 3.6.