Theophylact of Ohrid

"And, behold, they cried out, saying, What have we to do with Thee, Jesus, Thou Son of God? Art Thou come hither to torment us before the time?" Behold, they proclaim Him to be the Son of God, but first they declare their enmity. The demons consider it torment to be prevented from harming men. Understand the demons' words, "before the time," to mean that they thought that Christ, not enduring their great wickedness, would not wait for the time of their punishment. …

Commentary on Matthew ↗

Augustine of Hippo

God was so far known to them as it was His pleasure to be known; and He pleased to be known so far as it was needful. He was known to them therefore not as He is Life eternal, and the Light which enlightens the good, but by certain temporal effects of His excellence, and signs of His hidden presence, which are visible to angelic spirits though evil, rather than to the infirmity of human nature. (De Civ. Dei, viii. …

Catena Aurea by Aquinas ↗

Jerome

This is no voluntary confession followed up by a reward to the utterer, but one extorted by the compulsion of necessity. A runaway slave, when after long time he first beholds his master, straight thinks only of deprecating the scourge; so the dæmons, seeing the Lord suddenly moving upon the earth, thought He was come to judge them. Some absurdly suppose, that these dæmons knew the Son of God, while the Devil knew Him not, because their wickedness was less than his. …

Catena Aurea by Aquinas ↗

Thomas Aquinas

Their uneasiness is shown, because they did not endure the presence of Christ; hence it is said that they cried out: "You shall cry out for pain of heart, and shall wail for anguish of spirit" (Is 65:14). Then they admit God's power, saying, What have you to do with us, Son of God? Absolutely nothing, because there is no conformity between God and Belial. But why did they say this? Because they were seriously afflicting men, and they had heard that Christ would take their power from them. …

Commentary on Matthew ↗