Augustine of Hippo

"His toil shall be turned on his head, and his iniquity shall descend on his pate" [Psalm 7:16]. For he had no mind to escape sin: but was brought under sin as a slave, so to say, as the Lord says, "Whosoever sins is a slave." [John 8:34] His iniquity then will be upon him, when he is subject to his iniquity; for he could not say to the Lord, what the innocent and upright say, "My glory, and the lifter up of my head." He then will be in such wise below, as that his iniquity may be above, and descend on him; for that it weighs him …

Exposition on Psalm 7 ↗

Jerome

'His sorrow shall be turned upon his own head, and his iniquity shall come down upon his own crown.' Just as if someone throws a stone on high, and is not careful, and the stone comes down upon his head, he is wounded by his own wound; so too the devil is slain by his own pride, he exalts himself and falls in ruin. 'His sorrow shall be turned upon his own head.' The devil now wishes to lift up his head, but cannot. Why can he not lift up his head? Because his sorrow is turned upon his head, and presses him down. …

Homily 3, on Psalm 7 ↗