Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 1:4-8

“Or else; The garment of camel’s hair was significative of grief, for John pointed out, that he who repented should mourn. For sackcloth signifies grief; but the girdle of skins shews the dead state of the Jewish people. The food also of John not only denotes abstinence, but also shews forth the intellectual food, which the people then were eating, without understanding any thing lofty, but continually raising themselves on high, and again sinking to the earth. For such is the nature of locusts, leaping on high and again falling. In the same way the people ate honey, which had come from bees, that is, from the prophets; it was not however domestic, but wild, for the Jews had the Scriptures, which are as honey, but did not rightly understand them.”