I. Introduction: the leading thought of the song, an adoring acknowledgment of what God had been and was to David (vv. 2-4).
II. A narrative of the Divine interpositions on his behalf, embracing his dangers, his prayers, and the Divine deliverances in reply (vv. 5-19).
III. The grounds of his protection and success (vv. 20-30).
IV. References to particular acts of God's goodness in various parts of his life, interspersed with reflections on the Divine character, from all which the assurance is drawn that that goodness would be continued to him and his successors, and would secure through coming ages the welfare and extension of the kingdom. And here we observe what is so common in the Psalms: a gradual rising above the idea of a mere earthly kingdom; the type passes into the antitype; the kingdom of David melts, as in a dissolving view, into the kingdom of the Messiah; thus a more elevated tone is given to the song, and the assurance is conveyed to every believer that as God protected David and his kingdom, so shall He protect and glorify the kingdom of His Son for ever.
I. In the burst of adoring gratitude with which the psalm opens as its leading thought, we mark David's recognition of Jehovah as the source of all the protection, deliverance, and success he had ever enjoyed, along with a special assertion of closest relationship to Him, in the frequent use of the word "my," and a very ardent acknowledgment of the claim to his gratitude thus arising—"God, who is worthy to be praised."
The feeling that recognised God as the Author of all his deliverances was intensely strong, for every expression that can denote it is heaped together: "My rock, my portion, my deliverer; the God of my rock, my shield; the horn of my salvation, my high tower, my refuge, my Saviour." He takes no credit to himself; he gives no glory to his captains; the glory is all the Lord's. He sees God so supremely the Author of his deliverance that the human instruments that helped him are for the moment quite out of view. He who, in the depths of his penitence, sees but one supremely injured Being, and says, "Against Thee, Thee only, have I sinned," at the height of his prosperity sees but one gracious Being, and adores Him, who only is his rock and his salvation. In an age when all the stress is apt to be laid on the human instruments, and God left out of view, this habit of mind is instructive and refreshing. It was a touching incident in English history when, after the battle of Agincourt, Henry V. of England directed the hundred and fifteenth Psalm to be sung; prostrating himself on the ground, and causing his whole army to do the same, when the words were sounded out, "Not unto us, O Lord, not unto us, but to Thy name give glory."
The emphatic use of the pronoun "my" by the Psalmist is very instructive. It is so easy to speak in general terms of what God is, and what God does; but it is quite another thing to be able to appropriate Him as ours, and rejoice in that relation. Luther said of the twenty-third Psalm that the word "my" in the first verse was the very hinge of the whole. There is a whole world of difference between the two expressions, "The Lord is a Shepherd" and "The Lord is my Shepherd." The use of the "my" indicates a personal transaction, a covenant relation into which the parties have solemnly entered. No man is entitled to use this expression who has merely a reverential feeling towards God, and respect for His will. You must have come to God as a sinner, owning and feeling your unworthiness, and casting yourself on His grace. You must have transacted with God in the spirit of His exhortation, "Come out from among them, and be ye separate, and touch not the unclean thing; and I will be a Father unto you; and ye shall be My sons and daughters, saith the Lord Almighty."
One other point has to be noticed in this introduction—when David comes to express his dependence on God, he very specially sets Him before his mind as "worthy to be praised." He calls to mind the gracious character of God,—not an austere God, reaping where He has not sown, and gathering where He has not strawed, but "the Lord, the Lord God merciful and gracious, long-suffering and abundant in goodness and truth." "This doctrine," says Luther, "is in tribulation the most ennobling and truly golden. One cannot imagine what assistance such praise of God is in pressing danger. For as soon as you begin to praise God the sense of the evil will also begin to abate, the comfort of your heart will grow; and then God will be called on with confidence. There are some who cry to the Lord and are not heard. Why is this? Because they do not praise the Lord when they cry to Him, but go to Him with reluctance; they have not represented to themselves how sweet the Lord is, but have looked only to their own bitterness. But no one gets deliverance from evil by looking simply upon his evil and becoming alarmed at it; he can get deliverance only by rising above his evil, hanging it on God, and having respect to His goodness. Oh, hard counsel, doubtless, and a rare thing truly, in the midst of trouble to conceive of God as sweet, and worthy to be praised; and when He has removed Himself from us and is incomprehensible, even then to regard Him more intensely than we regard our misfortune that keeps us from Him! Only let one try it, and make the endeavour to praise God, though in little heart for it he will soon experience an enlightenment."