Because of the voice of the enemy, because of the oppression of the wicked: for they cast iniquity upon me, and in wrath they hate me.
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Augustine of Hippo
5. Whence then doth this man pray, set among evil men, with whose enmities he was being exercised? Why saith he, "I have been made sad in my exercise, and have been troubled"? While he is extending his love so as to love enemies, he hath been affected with disgust, being bayed at all around by the enmities of many men, by the frenzy of many and under a sort of human infirmity he hath sunk. He hath seen himself now begin to be pierced through with an evil suggestion of the devil, to bring on hatred against his enemies: wrestling against hatred in order to perfect love herself, in the very fight, and in the wrestling, he hath been troubled. For there is his voice in another Psalm, "Mine eye hath been troubled, because of anger." And what followeth there? "I have waxen old among all mine enemies." As if in storm and waves he were beginning to sink, like Peter. For he doth trample the waves of this world, that loveth enemies. Christ on the sea was walking fearless, from whose heart there c...
Upon me. When a person has fallen into distress, the world is ever ready to attribute it to some fault. Absalom accused his father of neglecting to judge, 2 Kings xv. 2. The Jews calumniated and sought the death of Christ, whose agony in the garden is well described, (ver. 5.) as well as the consternation of David, at the sight of such a general revolt, (Calmet) which almost overwhelmed him. (Worthington)