Unto thee, O my strength, will I sing - The source of strength to me; the real strength by which I have obtained deliverance is in thee. See the notes at Psalms 18:1.
For God is my defense - See the notes at Psalms 59:9.
And the God of my mercy - The God who has showed mercy to me; he from whom all these favors have sprung. Whatever means might be used to secure his own safety (compare 1 Samuel 19:12 ff) still he felt that his deliverance was to be traced wholly to God. He had interposed and had saved him; and it was proper, therefore, that praise should be ascribed to him. The experience of David in the case referred to in this psalm should be an inducement to all who are in danger to put their trust in God; his anticipated feelings of gratitude, and his purpose to praise God when he should be delivered, should awaken in us the resolution to ascribe to God all the praise when we are delivered from impending troubles, and when our lives are lengthened out where we have been in imminent danger. Whatever may have been the means of our rescue, it is to be traced to the interposition of God.