Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 1:35-39

“He also mingled action with teaching, for whilst employed in preaching, He afterwards put to flight devils. For there follows: And casting out devils. For unless Christ shewed forth miracles, His teaching would not be believed; so do thou also, after teaching, work, that thy word be not fruitless in thyself.”