Charles H. Spurgeon on Psalms 105:31

He spake. See the power of the divine word. He had only to say it and it was done: and there came divers sorts of flies. Insects of various annoying kinds came up in infinite hordes, a mixture of biting, stinging, buzzing gnats, mosquitos, files, beetles, and other vermin such as make men's flesh their prey, the place of deposit for their eggs, and the seat of peculiar torments. And lice in all their coasts. These unutterably loathsome forms of life were as the dust of the ground, and covered their persons, their garments, and all they ate. Nothing is too small to master man when God commands it to assail him. The sons of Ham had despised the Israelites and now they were made to loathe themselves. The meanest beggars were more approachable than the proud Egyptians; they were reduced to the meanest condition of filthiness, and the most painful state of irritation. What armies the Lord can send forth when once his right arm is bared for war! And what scorn he pours on proud nations when he fights them, not with angels, but with lice! Pharaoh had little left to be proud of when his own person was invaded by filthy parasites. It was a slap in the face which ought to have humbled his heart, but, alas, man, when he is altogether polluted, still maintains his self conceit, and when he is the most disgusting object in the universe he still vaunts himself. Surely pride is moral madness.