Charles H. Spurgeon on Psalms 78:45

He sent diverse sorts of flies among them, which devoured them. Small creatures become great tormentors. When they swarm they can sting a man till they threaten to eat him up. In this case, various orders of insects fought under the same banner; lice and beetles, gnats and hornets, wasps and gadflies dashed forward in fierce battalions, and worried the sinners of Egypt without mercy. The tiniest plagues are the greatest. What sword or spear could fight with these innumerable bands? Vain were the monarch's armour and robes of majesty, the little cannibals were no more lenient towards royal flesh than any other; it had the same blood in it, and the same sin upon it. How great is that God who thus by the minute can crush the magnificent. And frogs, which destroyed them. These creatures swarmed everywhere when they were alive, until the people felt ready to die at the sight; and when the reptiles died, the heaps of their bodies made the land to stink so foully, that a pestilence was imminent. Thus not only did earth and air send forth armies of horrible life, but the water also added its legions of loathsomeness. It seemed as if the Nile was first made nauseous and then caused to leave its bed altogether, crawling and leaping in the form of frogs. Those who contend with the Almighty, little know what arrows are in his quiver; surprising sin shall be visited with surprising punishment.