That which the cutting locust has left has the swarming locust eaten; and that which the swarming locust has left has the crawling locust eaten; and that which the crawling locust has left has the consuming locust eaten.
All Commentaries on Joel 1:4 Go To Joel 1
John Cassian
AD 435
For although the Lord has granted strong cattle, bodily health, a successful outcome to every activity and prosperous deeds, prayer must still be offered lest, as it is written, there be “a heaven of brass and an earth of iron” and lest “the swarming locust eat what the cutting locust has left, and the caterpillar devour what the swarming locust has left, and the blight consume what the caterpillar has left.” Not in this alone does the effort of the toiling farmer stand in need of divine assistance. [His effort] must also fend off unexpected accidents by which, even if a field is loaded with the desired fruitful yield, he will not only be frustrated by waiting in vain for what he has hoped for but will even be deprived of the abundant crop that has already been harvested and that is stored on the threshing floor or in the barn. .