Charles H. Spurgeon on Psalms 65:6

Which by his strength setteth fast the mountains. He, as it were, fixed them in their sockets, and preserved them from falling by earthquake or storm. The firmest owe their stability to him. Philosophers of the forget God school are too much engrossed with their laws of upheaval to think of the Upheaver. Their theories of volcanic action and glacier action, etc., etc., are frequently used as bolts and bars to shut the Lord out of his own world. Our poet is of another mind, and sees God's hand settling Alps and Andes on their bases, and therefore he sings in his praise. Let me for ever be just such an unphilosophical simpleton as David was, for he was nearer akin to Solomon than any of our modern theorists. Being girded with power. The Lord is so himself, and he therefore casts a girdle of strength around the hills, and there they stand, braced, belted, and bulwarked with his might. The poetry is such as would naturally suggest itself to one familiar with mountain scenery; power everywhere meets you, sublimity, massive grandeur, and stupendous force are all around you; and God is there, the author and source of all. Let us learn that we poor puny ones, if we wish for true establishment, must go to the strong for strength. Without him, the everlasting hills would crumble; how much more shall all our plans, projects, and labours come to decay. Repose, O believer, where the mountains find their bases —viz., in the undiminished might of the Lord God.