But I am poor and needy. David could say this in time of trouble. No one is more in need than a discrowned king, driven from his throne and land, and not yet restored to either (2 Samuel 9:4 -20). Yet the Lord thinketh upon me. The "poor and needy" are those whom God especially considers (see Psalms 9:18; Psalms 10:12, Psalms 10:17, Psalms 10:18; Psalms 34:6; Psalms 35:10, etc.). Thou art my Help and my Deliverer; make no tarrying, O my God (comp. Psalms 40:13, and the comment ad loc.).
HOMILETICS