Synopsis of the Books of the Bible, by John Nelson Darby, [1857-62], at sacred-texts.com
Psalm 115 gives the true and full ground of this deliverance as seen in the heart of faith. It is not that they, but that Jehovah may be praised, specially in His mercy, and then His faithfulness to promise. The godly one, that is, the Spirit, then refers to that cry which was the bitter grief spoken of in Joel, and referred to in Psalms 42, 43. Why should the heathen say, Where is now their God? So in the same spirit Moses "the Egyptians shall hear of it, and what wilt thou do to thy great name?" What a blessed boldness of faith! This character of sorrow shows, how it was on the cross and in those last sorrows that Christ came into this character of sorrow. For the Jews practically said this to Him then, but never could have done so before. The believing Israelite's answer is, Our God is in heaven.
He then contrasts Him with idols. And Israel, the house of Aaron, and all that fear Jehovah, are called to trust Him. This last would open the door to all Gentiles who sought Jacob's face. It then recites, what we have seen to be the ground these psalms go on, that He had been mindful of, and would bless them; yea, increase them more and more, them and their children. They were the blessed of Jehovah, the maker of heaven and earth. Heaven was His, the earth had He given to men. This marks how distinctly the earthly blessing is the scene before us, for He has not given us the earth, but the cross in it; and heaven, and what is there, as our own things. We seek the things which are above, not the things which are on the earth. So, in even almost a stronger manner, the dead do not praise Jehovah; but we (says the Spirit in them) will praise from this, the time of their final deliverance, for evermore. We say "to depart and to be with Christ is far better."