Bede the Venerable — as excerpted in the Catena Aurea on Mark 2:13-17

“(ubi sup.) Now to follow is to imitate, and therefore in order to imitate the poverty of Christ, in the feeling of his soul even more than in outward condition, he who used to rob his neighbour’s wealth, now leaves his own. And not only did he quit the gain of the customs, but he also despised the peril, which might come from the princes of this world, because he left the accounts of the customs imperfect and unsettled. For the Lord Himself, Who externally, by human language, called Him to follow, inflamed him inwardly by divine inspiration to follow Him the moment that He called him.”