Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 8:1-9

“Or there are four thousand, that is, men perfect in the four virtues; and for this reason, as being more advanced, they ate more, and left fewer fragments. For in this miracle, seven baskets full remain, but in the miracle of the five loaves, twelve, for there were five thousand men, which means men enslaved to the five senses, and for this reason they could not eat, but were satisfied with little, and many remains of the fragments were over and above.”