Charles H. Spurgeon on Psalms 136:13

To him which divided the Red sea into parts. He made a road across the sea bottom, causing the divided waters to stand like walls on either side. Men deny miracles; but, granted that there is a God, they become easy of belief. Since it requires me to be an atheist that I may logically reject miracles, I prefer the far smaller difficulty of believing in the infinite power of God. He who causes the waters of the sea ordinarily to remain as one mass can with equal readiness divide them. He who can throw a stone in one direction can with the same force throw it another way: the Lord can do precisely what he wills, and he wills to do anything which is ten the deliverance of his people. For his mercy endureth for ever, and therefore it endures through the sea as well as over the dry land. He will do a new thing to keep his old promise. His way is in the sea, and he will make a way for his people in the same pathless region.

Lo, the Red Sea he divides,

For his mercy sure abides.