Charles H. Spurgeon on Psalms 115:1

Whole Psalm. Several manuscripts and editions, also the Septuagint, the Syriac, and many of the old translators join this Psalm to the preceding, and make one of them. But the argument and the arrangement of the two Psalms do not allow of the least doubt as to their original independence of each other. Justus Olshausen.

Not unto us, O LORD, not unto us, but unto thy name give glory. The Psalmist, by this repetition, implies our natural tendency to self idolatry, and to magnifying of ourselves, and the difficulty of cleansing our hearts from these self reflections. If it be angelical to refuse an undue glory stolen from God's throne, Re 12:8-9; it is diabolical to accept and cherish it. "To seek our own glory is not glory, "Pr 25:27. It is vile, and the dishonour of a creature, who, by the law of his creation, is referred to another end. So much as we sacrifice to our own credit, to the dexterity of our hands, or the sagacity of our wit, we detract from God. Stephen Charnock.