Bede the Venerable — as excerpted in the Catena Aurea on Mark 8:34-38

“After shewing to His disciples the mystery of His passion and resurrection, He exhorts them, as well as the multitude, to follow the example of His passion. Wherefore it goes on; And when he had called the people unto him with his disciples also, he said unto them, Whosoever wishes to come after me, let him deny himself.”