Charles H. Spurgeon on Psalms 144:5

Bow thy heavens, O LORD, and come down. The heavens are the Lord's own, and he who exalted them can bow them. His servant is struggling against bitter foes, and he finds no help in men, therefore he entreats Jehovah to come down to his rescue. It is, indeed, a coming down for Jehovah to interfere in the conflicts of his tried people. Earth cries to heaven to stoop; nay, the cry is to the Lord of heaven to bow the heaven, and appear among the sons of earth. The Lord has often done this, and never more fully than when in Bethlehem the Word was made flesh and dwelt among us: now doth he know the way, and he never refuses to come down to defend his beloved ones. David would have the real presence of God to counterbalance the mocking appearance of boastful man: eternal verity could alone relieve him of human vanity. Touch the mountains, and they shall smoke. It was so when the Lord appeared on Sinai; the strongest pillars of earth cannot bear the weight of the finger of God. He is a consuming fire, and his touch kindles the peaks of the Alps, and makes them smoke. If Jehovah would appear, nothing could stand before him; if the mighty mountains smoke at his touch, then all mortal power which is opposed to the Lord must end in smoke. How long suffering he is to his adversaries, whom he could so readily consume. A touch would do it; God's finger of flame would set the hills on fire, and consume opposition of every kind.