Mark 1:16-20
16 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.
17 And Jesus said unto them, Come ye after me, and I will make you to become fishers of men.
18 And straightway they forsook their nets, and followed him.
19 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.
20 And straightway he called them: and they left their father Zebedee in the ship with the hired servants, and went after him.
Christ appearing as a teacher, here is his next calling of disciples, Mark 1:16-20. Observe,
1. Christ will have followers If he set up a school, he will have scholars; if he set up his standard, he will have soldiers; if he preach, he will have hearers. He has taken an effectual course to secure this; for all that the Father has given him, shall, without fail, come to him.
2. The instruments Christ chose to employ in setting up his kingdom, were the weak and foolish things of the world; not called from the great sanhedrim [sic], or the schools of the rabbin, but picked up from among the tarpaulins by the sea-side, that the excellency of the power might appear to be wholly of God, and not at all of them.
3. Though Christ needs not the help of man, yet he is pleased to make use of it in setting up his kingdom, that he might deal with us not in a formidable but in a familiar way, and that in his kingdom the nobles and governors may be of ourselves, Jer. 30:21.
4. Christ puts honor upon those who, though mean in the world, are diligent in their business, and loving to one another; so those were, whom Christ called. He found them employed, and employed together. Industry and unity are good and pleasant, and there the Lord Jesus commands the blessing, even this blessing, Follow me.
5. The business of ministers is to fish for souls, and win them to Christ. The children of men, in their natural condition, are lost, wander endlessly in the great ocean of this world, and are carried down the stream of its course and way; they are unprofitable. Like leviathan in the waters, they play therein; and often, like the fishes of the sea, they devour one another. Ministers, in preaching the gospel, cast the net into the waters, Matt. 13:47. Some are enclosed and brought to shore, but far the greater number escape. Fishermen take great pains, and expose themselves to great perils, so do ministers; and they have need of wisdom. If many a draught brings home nothing, yet they must go on.
6. Those whom Christ calls, must leave all, to follow him; and by his grace he inclines them to do so. Not that we must needs go out of the world immediately, but we must sit loose to the world, and forsake every thing that is inconsistent with our duty to Christ, and that cannot be kept without prejudice to our souls. Mark takes notice of James and John, that they left not only their father (which we had in Matthew), but the hired servants, whom perhaps they loved as their own brethren, being their fellow-labourers and pleasant comrades; not only relations, but companions, must be left for Christ, and old acquaintance. Perhaps it is an intimation of their care for their father; they did not leave him without assistance, they left the hired servants with him. Grotius thinks it is mentioned as an evidence that their calling was gainful to them, for it was worth while to keep servants in pay, to help them in it, and their hands would be much missed, and yet they left it.
— Matthew Henry (1662 - 1714)