Pseudo-Jerome — as excerpted in the Catena Aurea on Mark 14:26-31

“In which the true resurrection is promised, that their hope may not be extinguished. There follows: But Peter said unto him, Although all shall be offended, yet will not I. Lo, a bird unfledged strives to raise itself on high; but the body weighs down the soul, so that the fear of the Lord is overcome by the fear of human death.”