Luke 8:47

He that is of God, &c. He here assigns the true reason for the unbelief of the Jews, because they were born not of God, but of the devil; that is, ye do not listen to the spirit and instinct of God, but of the devil. For the devil has blinded your hearts with covetousness, hatred, and envy of Me. And ye therefore listen not to the words of God which I, who am sent from Him, announce to you, because ye will not hear and understand them. Because then ye are not the children of God who is true, but of the devil who is a liar, ye listen to his lying suggestions, but will not give a hearing to the true words of God which are uttered by Me.

Moreover S. Augustine and S. Gregory (Hom. xviii.) understand these words of the elect and reprobate. He who is predestinated and elected hears the words of God, ye hear them not because ye are reprobate. But this is not the literal and genuine sense of the word, but merely an adapted one. For as Toletus and Maldonatus observe, many of those who at that time did not believe in Christ afterwards believed at the preaching of S. Peter and the Apostles; and on the other hand, some who then believed in Christ afterwards fell away from the faith, and became reprobates (see Joh 6:67).

Lastly, the Manichees inferred wrongly from the passage (as S. Augustine asserts) that some men are good by their own nature, as created by the good God, but others are naturally evil, as created by the evil principle.

Morally: S. Gregory infers thus from this saying of Christ: "Let each one ask himself if he takes in the word of God with the ear of his heart, and he will understand whence it is. The truth bids us long for the heavenly country, to crush the desires of the flesh, to shun the glory of the world, not to covet others' goods, to be liberal with one's own. Let each one of you consider with himself if this voice of God has prevailed in the ear of his heart, and he will acknowledge that it is from God." And just below, "There are some who willingly listen to the words of God so as to be moved by compunction even to tears, but who after their tears go back again to their sin. And these assuredly hear not the words of God, because they scorn to carry them out in deed." Hence S. Gregory infers that it is a mark of divine predestination if a man obeys the holy inspirations of God, and of reprobation if he rejects them (see Pro 1:24). And John 10:27, "My sheep hear My voice." They who hear the voice of Christ their Shepherd are saved, they who hear not are devoured by the devil. So too Christ says plainly, "Blessed are they who hear the word of God and keep it" (Luke 11:25). And S. Bernard (Serm. 1 , in Septuag.) tells his monks that the greatest proof of predestination is the profitable hearing of the word of God. For it was their constant food, by reading and meditation and prayer, to examine whatever proceeds from the mouth of God, and to fulfil it in their lives.