Theophylact of Ohrid
Catena Aurea · Markusevangelium 1
Now as he walked by the sea of Galilee, he saw Simon and Andrew his brother casting a net into the sea: for they were fishers. And Jesus said unto them, Come ye after me, and I will make you to become fishers of men. And straightway they forsook their nets, and followed him. And when he had gone a little farther thence, he saw James the son of Zebedee, and John his brother, who also were in the ship mending their nets. And straightway he called them: and they left their father Zebedee in the ship with the hired servants, and went after him.
As the Evangelist John relates, Peter and Andrew were disciples of the Forerunner, but seeing that John had borne witness to Jesus, they joined themselves to him; afterwards, grieving that John had been cast into prison, they returned to their trade. Wherefore there follows, casting nets into the sea, for they were fishers. Look then upon them, living on their own labours, not on the fruits of iniquity; forsuch men were worthy to become the first disciples of Christ; whence it is subjoined, And Jesus said unto them, Come ye after me. Now He calls them for the second time; for this is the second calling in respect of that, of which we read in John. But it is shewn to what they were called, when it is added, I will make you become fishers of men.