Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 12:47-48

“But he goes on to shew why teachers and learned men deserve a severer punishment, as it is said, For unto whomsoever much is given, of him shall be much required. Teachers indeed are given the grace to perform miracles, but entrusted the grace of speech and learning. But not in that which is given, He says, is any thing more to be sought, but in that which is entrusted or deposited; for the grace of the word needs increase. But from a teacher more is required, for he should not lie idle, but improve the talent of the word.”