Cyrill of Alexandria
The caterpillar is referred to as the morning worm because it begins its life nourished by the dew that descends before dawn. God directs this creature, as well as the scorching wind, in the same manner He commands the plant and the great fish. In an instant, the plant withered, and the fierce wind assailed him, while the sun's heat bore down on the weakened man, who found himself exposed and without shelter. This intensified his sorrow to the point where he longed for death itself.