<p>Gnats live for a single day. They're born, they swarm, they die. New ones replace them. So why do they exist at all? Nebuchadnezzar wanted to know, and Ben Sira had a two-part answer that stretches from Roman history to the nesting habits of ravens.</p>

<p>According to the Alphabet of Ben Sira, composed between 700 and 1000 CE, gnats were created for two reasons. The first is about justice. One day, a single gnat would bring down the wicked Titus - the Roman emperor who destroyed the Temple in 70 CE. Jewish tradition holds that a gnat entered Titus's brain through his nostril and tormented him for years until it killed him. An entire species exists, in part, because of one future act of divine retribution.</p>

<p>The second reason is gentler. When baby ravens hatch from their eggs, they're pale and featherless - so unlike adult ravens that their own parents don't recognize them. The parent birds flee the nest, leaving the chicks to cry out in hunger. As it says in (Psalms 147:9), God provides "to the raven's brood what they cry for." And what does God send? Gnats. The tiny insects swarm near the helpless chicks, who eat them and survive for three days. After three days, the chicks' feathers darken, their parents recognize them, and they return.</p>

<p>Here again is the Alphabet's recurring theological argument: God prepares the cure before the harm. The gnat, worthless in human eyes, is the mechanism by which both justice and mercy operate in the world.</p>