Not unto us, O Jehovah! It is not certain by whom, or at what time, this psalm was composed. [1] We learn from the first part of it, that the faithful betake themselves to God, in circumstances of extreme distress. They do not make known their desires in plain words, but indirectly hint at the nature of their request. They openly disclaim all merit, and all hope of obtaining deliverance otherwise than God's doing it from a sole regard to his own glory, for these things are inseparably connected. Deserving, therefore, to meet with a repulse, they yet beseech God not to expose his name to the derision of the heathen. In their distress they desire to obtain consolation and support; but, finding nothing in themselves meritorious of God's favor, they call upon him to grant their requests, that his glory may be maintained. This is a point to which we ought carefully to attend, that, altogether unworthy as we are of God's regard, we may cherish the hope of being saved by him, from the respect that he has for the glory of his name, and from his having adopted us on condition of never forsaking us. It must, also be noticed, that their humility and modesty prevent them from openly complaining of their distresses, and that they do not begin with a request for their own deliverance, but for the glory of God. Suffused with shame by reason of their calamity, which, in itself, amounts to a kind of rejection, they durst not openly crave, at God's hand, what they wished, but made their appeal indirectly, that, from a regard to his own glory, he would prove a father to sinners, who had no claim upon him whatever. And, as this formulary of prayer has once been delivered to the Church, let us also, in all our approaches unto God, remember to lay aside all self-righteousness, and to place our hopes entirely on his free favor. Moreover, when we pray for help, we ought to have the glory of God in view, in the deliverance which we obtain. And it is most likely they adopted this form of prayer, being led to do so by the promise. For, during the captivity, God had said, "Not for your sake, but for mine own sake will I do this," Isaiah 48:11. When all other hopes fail, they acknowledge this to be their only refuge. The repetition of it is an evidence how conscious they were of their own demerit, so that, if their prayers should happen to be rejected a hundred times, they could not, in their own name, prefer any charge against him.

Footnotes

1 - "As the former psalm ended abruptly, and this is connected with it by the Septuagint, Vulgate, Syriac, Arabic, Æthiopic, with nineteen MSS.; and as the following ejaculations so naturally arise from the consideration of the wonderful works of Jehovah just before recited, Lorinus's opinion, that it is only a continuation of the former, is not improbable. Patrick refers it to 2 Chronicles 20:2. Some suppose it to be written by Moses at the Red Sea. Others, by David in the beginning of his reign. Others, by Mordecai and Esther. Others, by the three children in the fiery furnace. Perhaps by Hezekiah, or some one in the Babylonish captivity. -- See Psalm 114:1." -- Dimoch. "There is nothing certain," observes Walford, "to be concluded respecting the author of this psalm, or the occasion on which it was written. It is conjectured, however, to belong to the time of Hezekiah, and to have been composed in celebration of the very extraordinary deliverance which was afforded to that pious prince, and to his people, from the blasphemies and arrogance of Sennacherib, the king of Assyria, 2 Chronicles 32; Isaiah 37:37. Whether this conjecture be agreeable to the truth, we are unable to say, though a considerable probability that it is so, arises from the language of the psalm itself."

Not unto us, O Lord, not unto us, but unto thy name give glory - This apparently abrupt commencement of the psalm was undoubtedly in reference to some circumstances which would be well understood at the time when the psalm was composed, but which cannot be definitely ascertained now. It seems to have been in view of some existing troubles, and the language at the same time expresses a hope of the divine interposition, and a feeling that the praise of such interposition would belong wholly to God. The phrase "give glory" means, give all the honor and praise. See the notes at Psalm 29:1-2.
For thy mercy - The mercy or the favor which we seek and look for - thy gracious help in the time of trouble.
And for thy truth's sake - Thy faithfulness to thy promises; thy faithfulness to thy people. The psalmist anticipated this manifestation of faithfulness with confidence; he felt that all the praise for such an anticipated interposition would belong to God.

Not unto us, O Lord - We take no merit to ourselves; as thine is the kingdom, and the power in that kingdom, so is thy glory.
For thy mercy, and for thy truth's sake - Thy mercy gave thy promise, thy truth fulfilled it.

Not (a) unto us, O LORD, not unto us, but unto thy name give glory, for thy mercy, [and] for thy truth's sake.
(a) Because God promised to deliver them, not for their sakes, but for his Name, (Isaiah 48:11), therefore they ground their prayer on this promise.

Not unto us, O Lord, not unto us, but unto thy name give glory,.... There is no glory due to men; no, not to the best of men, not to be given them on any account whatever; neither on account of things natural, civil, and temporal, nor on account of things spiritual and eternal; but all to be given to the Lord: for, as for their beings and the preservation of them, with all the mercies of life, food, raiment, &c. they are not of themselves, but of the Lord; and so are the salvation of their souls, their election and redemption, their regeneration, conversion, and sanctification, their justification and pardon; whatsoever good thing is in them, or done by them: nor have they anything for the sake of righteousness done by them; nor do they desire to take the glory of past favours to themselves; nor request deliverance from present evils for their own merits, which they disclaim; nor for their own sakes, or that they may be great and glorious; but for the Lord's sake, for his name's sake, that he may be glorified; which is the principal sense of the passage. So the Targum,
"not for our sakes. O Lord, not for our merit, but to thy name give glory.''
Good men desire to glorify God themselves, by ascribing to him the perfections of his nature, and celebrating them; by giving thanks to him for mercies, spiritual and temporal; by exercising faith upon him, as a promising God; and by living to his glory: and they are very desirous that all others would give him the glory due unto his name; and that he would glorify himself, and get himself a glorious and an everlasting name. And indeed the words are addressed to him, and not to others; and particularly that he would glorify, or take the glory of the following perfections:
for thy mercy, and for thy truth's sake; so very manifest in the salvation of his people, and in all their deliverances, and therefore ought to have the glory of them. His "mercy", or his "grace" (w), as it may be rendered, is displayed in the salvation of his people by Christ, in their regeneration, justification, pardon, and eternal life: and so is his truth, or faithfulness in all his promises; and particularly in the mission of his Son as a Saviour, so long promised and expected; and who is "truth" himself, the truth of all promises and prophecies; and by whom the truth of the Gospel came, the Word, which God has magnified above every name.
(w) "propter gratiam tuam", Cocceius, Michaelis.

Let no opinion of our own merits have any place in our prayers or in our praises. All the good we do, is done by the power of his grace; and all the good we have, is the gift of his mere mercy, and he must have all the praise. Are we in pursuit of any mercy, and wrestling with God for it, we must take encouragement in prayer from God only. Lord, do so for us; not that we may have the credit and comfort of it, but that they mercy and truth may have the glory of it. The heathen gods are senseless things. They are the works of men's hands: the painter, the carver, the statuary, can put no life into them, therefore no sense. The psalmist hence shows the folly of the worshippers of idols.

The Psalmist prays that God would vindicate His glory, which is contrasted with the vanity of idols, while the folly of their worshippers is contrasted with the trust of God's people, who are encouraged to its exercise and to unite in the praise which it occasions. (Psalm. 115:1-18)
The vindication of God's mercy and faithfulness (Psalm 25:10; Psalm 36:6) is the "glory" of His "name," which is desired to be illustrated in the deliverance of His people, as the implied mode of its manifestation. In view of the taunts of the heathen, faith in His dominion as enthroned in the heaven (Psalm 2:4; Psalm 11:4) is avowed.

It has to do not so much with the honour of Israel, which is not worthy of the honour (Ezekiel 36:22.) and has to recognise in its reproach a well-merited chastisement, as with the honour of Him who cannot suffer the reproaching of His holy name to continue long. He willeth that His name should be sanctified. In the consciousness of his oneness with this will, the poet bases his petition, in so far as it is at the same time a petition on behalf of Israel, upon God's cha'ris and alee'theia as upon two columns. The second על, according to an express note of the Masora, has no Waw before it, although the lxx and Targum insert one. The thought in Psalm 115:2 is moulded after Psalm 79:10, or after Joel 2:17, cf. Psalm 42:4; Micah 7:10. איּה־נא is the same style as נגדּה־נּא in Psalm 116:18, cf. in the older language אל־נא, אם־נא, and the like.