The consciousness of unworthiness passes, in verse 19, to adoring contemplation of God's astounding mercy, and especially of the new element in Nathan's prophecy,—the perpetuity of the Davidic sovereignty in the dim, far-off future. Thankfulness delights to praise the Giver for the greatness of His gift. Faith strengthens its hold of its blessings by telling them over, as a miser does his treasure. To recount them to God is the way to possess them more fully.
The difficult close of the verse cannot be discussed here. 'The law for man' is nearer the literal meaning of the words than 'the manner of men' (Rev. Ver.); and, unfortunately, man's manner is not the same as man's law. But the usual explanations are unsatisfactory. We would hazard the suggestion that 'this' means that which God has spoken 'of thy servant's house,' and that to call it 'the law for man' is equivalent to an expression of absolute confidence in the authority, universality, and certain fulfilment of the promise. The speech of God is ever the law for man, and this new utterance stands on a level with the older law, and shall rule all mankind. The king's faith not only gazes on the great words of promise, but sees them triumphant on earth.
Then in verse 20 comes another bend of the stream of praise. The more full the heart, the more is it conscious of the weakness of all words. The deepest praise, like the truest love, speaks best in silence. It is blessed when, in earthly relations, we can trust our dear ones' knowledge of us to interpret our poor words. It is more blessed when, in our speech to God, we can feel that our love and faith are deeper than our word, and that He does not judge them by it, but it by them.
'Silence is His least injurious praise.'
Here, too, we may note the two instances, in this verse, of what runs through the whole prayer,—David's avoidance of using 'I.' Except in the lowly 'What am I?' at the beginning, it never occurs; but he calls himself 'David' twice and 'Thy servant' ten times,—a striking, because unconscious, proof of his lowly sense of unworthiness.
But he can say more; and what he does further say goes yet deeper than his former words. The personal aspect of the promise retreats into the background, and the ground of all God's mercy in His 'own heart' fills the thoughts. Some previous promise, perhaps that through Samuel, is referred to; but the great truth that God is His own motive, and that His love is not drawn forth by our deserts, but wells up by its own energy, like a perennial fountain, is the main thought of the verse. God is self-moved to bless, and He blesses that we may know Him through His gifts. The one thought is the central truth, level to our apprehension, concerning His nature; the other is the key to the meaning of all His workings. All comes to pass because He loves with a self-originated love, and in order that we may know the motive and principle of His acts. We can get no farther into the secret of God than that. We need nothing more for peaceful acceptance of His providences for ourselves and our brethren. All is from love; all is for the manifestation of love. He who has learned these truths sits at the centre and lives in light.
Verse 22 strikes a new note. The effect of God's dealing with David is to magnify His name, to teach His incomparable greatness, and to confirm by experience ancient words which celebrate it. The thankful heart rejoices in hearsay being changed into personal knowledge. 'As we have heard, so have we seen.' Old truths flash up into new meaning, and only he who tastes and sees that God is good to him to-day really enters into the sweetness of His recorded past goodness.
Note the widening of David's horizon in verses 23 and 24 to embrace all Israel. His blessings are theirs. He feels his own relation to them as the culmination of the long series of past deliverances, and at the same time loses self in joy over Israel's confirmation as God's people by his kingship. True thankfulness regards personal blessings in their bearing on others, and shrinks from selfish use of them. Note, too, the parallel, if we may call it so, between Israel and Israel's God, in that 'there is none like Thee,' and by reason of its choice by this incomparable Jehovah, no nation on earth is like 'Thy people, even like Israel.'
Thus steadily does this model of thanksgiving climb up from a sense of unworthiness, through adoration and gazing on its treasures, to God's unmotived love as His impulse, and men's knowledge of that love as His aim, and pauses at last, rapt and hushed, before the solitary loftiness of the incomparable God, and the mystery of the love, which has intertwined the personal blessings which it celebrates, with its great designs for the welfare of the people, whose unique position corresponds to the unapproachable elevation of its God.
II. Verses 25 to 29 are prayer built on promise and winged by thankfulness. The whole of these verses are but the expansion of 'do as Thou hast said.' But they are not vain repetitions. Rather they are the outpourings of wondering thankfulness and faith, that cannot turn away from dwelling on the miracle of mercy revealed to it unworthy. God delights in the sweet monotony and persistence of such reiterated prayers, each of which represents a fresh throb of desire and a renewed bliss in thinking of His goodness. Observe the frequency and variety of the divine names in these verses,—in each, one, at least: Jehovah God (v. 25); Jehovah of hosts (v. 26); Jehovah of hosts, God of Israel (v. 27); Lord Jehovah (vs. 28, 29). Strong love delights to speak the beloved name. Each fresh utterance of it is a fresh appeal to His revealed nature, and betokens another wave of blessedness passing over David's spirit as he thinks of God. Observe, also, the other repetition of 'Thy servant,' which occurs in every verse, and twice in two of them. The king is never tired of realising his absolute subjection, and feels that it is dignity, and a blessed bond with God, that he should be His servant. The true purpose of honour and office bestowed by God is the service of God, and the name of 'servant' is a plea with Him which He cannot but regard. Observe, too, how echoes of the promise ring all through these verses, especially the phrases 'establish the house' and 'for ever.' They show how profoundly David had been moved, and how he is labouring, as it were, to make himself familiar with the astonishing vista that has begun to open before his believing eyes. Well is it for us if we, in like manner, seek to fix our thoughts on the yet grander 'for ever' disclosed to us, and if it colours all our look ahead, and makes the refrain of all our hopes and prayers.