John Chrysostom
To demonstrate that not only justice necessitated it, but also that the grace of the Holy Spirit had long foretold this and that God had predetermined its outcome, Christ references a prophecy and admonishes them, saying, "Have ye never read in the Scriptures, that the stone which the builders rejected, the same was made the head of the corner? This is from the Lord, and is marvelous in our eyes?" He makes it clear to the Jews that they, in their disbelief, will be cast aside, while the Gentiles will be welcomed. This was illustrated through His interaction with the Canaanite woman, the choice of the donkey at His entry into Jerusalem, the example of the centurion, and numerous parables; He emphasizes this point once again.
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By stating, "This is from the Lord, and is marvelous in our eyes," He reveals that Gentile believers and the believing Jews will unite, regardless of their previous separations. Furthermore, to clarify that these events do not contradict God's perfection, but rather align harmoniously with it, and evoke wonder in everyone—for indeed, it was an extraordinary miracle—Christ continued, "This is from the Lord." He identifies Himself as the stone and the Jewish leaders as the builders; Ezekiel also notes, "When he builds the wall, they cover it with mud" (Ezekiel 13:10). How is it that they rejected Him? They did so when they claimed, "This man is not of God" (John 9:16); "he deceives the people" (John 7:12); and also, "Thou art a Samaritan, and ... a demon is in thee" (John 8:48).