Charles H. Spurgeon on Psalms 104:13

He watereth the hills from his chambers. As the mountains are too high to be watered by rivers and brooks, the Lord himself refreshes them from those waters above the firmament which the poet had in a former verse described as the upper chambers of heaven. Clouds are detained among the mountain crags, and deluge the hill sides with fertilizing rain. Where man cannot reach the Lord can, whom none else can water with grace he can, and where all stores of refreshment fail he can supply all that is needed from his own halls. The earth is satisfied with the fruit of thy works. The result of the divine working is fulness everywhere, the soil is saturated with rain, the seed germinates, the beasts drink, and the birds sing —nothing is left without supplies. So, too, is it in the new creation, he giveth more grace, he fills his people with good, and makes them all confess, "of his fulness have all we received and grace for grace."