Charles H. Spurgeon on Psalms 65:6

Setteth fast the mountains. It is by thy strength they have been raised, and by thy power they are girded about and preserved. He represents the mountains as being formed and pitched into their proper places by the mighty hand of God; and shows that they are preserved from splitting, falling down, or moulding away, as it were, by a girdle by which they are surrounded. The image is very fine. They were hooped about by the divine power. Adam Clarke.