Charles H. Spurgeon on Psalms 78:15

He clave the rocks in the wilderness. Moses was the instrument, but the Lord did it all. Twice he made the flint a gushing rill. What can he not do? And gave them drink as out of the great depths, —as though it gushed from earth's innermost reservoirs. The streams were so fresh, so copious, so constant, that they seemed to well up from the earth's primeval fountains, and to leap at once from "the deep which coucheth beneath." Here was a divine supply for Israel's urgent need, and such an one as ought to have held them for ever in unwavering fidelity to their wonder working God.