And he answered and told them,
Elijah truly comes first, and restores all things; and how it is written of the Son of man, that he must suffer many things, and be treated with contempt.
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Cornelius a Lapide
AD 1637
And be despised: Gr. ε̉ξουδενωθη̃, i.e, be nothing accounted of. Understand, thus shall it happen to Elias, that when by his great labours he has restored the faith, he shall in return for such great benefits receive curses and ill-treatment from the ungrateful and the impious, and shall at last be killed by them.
“Then”—when? When he was confessed to be the Christ, the Son of God. Again on the mountain, when he had shown them the marvelous vision, and the prophets had been discoursing of his glory, he reminded them of his passion. Gospel of St. Matthew, Homily
Note the extreme accuracy of [the prophetic] expression. He does not say “He will restore the heart of the son to the father,” but “of the father to the son.” Gospel of St. Matthew, Homily