For he hath delivered me out of all trouble - This is spoken either in confident expectation of what would be, or as the statement of a general truth that God did deliver him from all trouble. It was what he had experienced in his past life; it was what he confidently expected in all time to come.
And mine eye hath seen his desire upon mine enemies - The words "his desire" are not in the original. A literal translation would be, "And on my enemies hath my eye looked." The meaning is, that they had been overthrown; they had been unsuccessful in their malignant attempts against him; and he had had the satisfaction of "seeing" them thus discomfited. Their overthrow had not merely been reported to him, but he had had ocular demonstration of its reality. This is not the expression of malice, but of certainty. The fact on which the eye of the psalmist rested was his own safety. Of that he was assured by what he had witnessed with his own eyes; and in that fact he rejoiced. There is no more reason to charge malignity in this case on David, or to suppose that he rejoiced in the destruction of his enemies as such, than there is in our own case when we are rescued from impending danger. It is proper for Americans to rejoice in their freedom, and to give thanks to God for it; nor, in doing this, is it to be supposed that there is a malicious pleasure in the fact that in the accomplishment of this thousands of British soldiers were slain, or that thousands of women and children as the result of their discomfiture were made widows and orphans. We can be thankful for the mercies which we enjoy without having any malignant delight in those woes of others through which our blessings may have come upon us.

For he hath delivered me - Saul had now decamped; and was returned to save his territories; and David in the meanwhile escaped to En-gedi. God was most evidently the author of this deliverance.
Mine eye hath seen his desire upon mine enemies - It is not likely that this Psalm was written after the death of Saul; and therefore David could not say that he had seen his desire. But there is nothing in the text for his desire; and the words might be translated, My eye hath seen my enemies - they have been so near that I could plainly discover them. Thus almost all the Versions have understood the text. I have seen them, and yet they were not permitted to approach me. God has been my Deliverer.

For he hath delivered me out of all trouble: and mine eye hath (g) seen [his desire] upon mine enemies.
(g) We may lawfully rejoice for God's judgments against the wicked, if our affections are pure.

For he hath delivered me out of all trouble,.... As he desired, 1-Samuel 26:24; that is, out of all his present trouble; not that he had no more afterwards; for as soon as one trouble is gone, generally speaking, another comes; but as God delivered him out of his present distress, so he believed he would deliver him out of all his afflictions in future times;
and mine eye hath seen his desire upon mine enemies: or revenge, as the Targum supplies it; not that he delighted in the destruction of his enemies, but in the justice of God glorified thereby, and in the goodness of God to him, in delivering him from them; see Revelation 18:20.

mine eye . . . desire--(compare Psalm 59:10; Psalm 112:8), expresses satisfaction in beholding the overthrow of his enemies as those of God, without implying any selfish or unholy feeling (compare Psalm 52:6-7).