Matthew 4:22

There are three things which we must leave who would come to Christ; carnal actions, which are signified in the fishing nets; worldly substance, in the ship; parents, which are signified in their father. They left their own vessel, that they might become governors of the vessel of the Church; they left their nets, as having no longer to draw out fishes on to the earthly shore, but men to the heavenly; they left their father, that they might become the spiritual fathers of all.

At the beginning of their election when He called them to go after Him, it is written of them that, "Immediately He called them they forsook everything and went after Him." They were casting nets into the sea and He saw and called them, "and they left their nets and their ship, and went after Him." And He saw also James and John in a ship with Zebedee their father, and He called them also, and straightway they left the net with Zebedee their father, and went after Him. Behold the law of the going forth after God! And behold the straight rule which hath been marked for us in the Holy Books! Therefore it is right that every man who desireth to go forth after God should emulate the going forth of the Apostles, and that he should despise and reject everything which is visible, and deny the whole world. The disciples are the beginning of the discipleship of Christians, and their calling was such----as it is written concerning them----that immediately they were called they forsook everything, and went forth after Him. And whosoever wisheth to become a disciple let him consider this example, and let him look at this mark with all his mind and understanding, in order that inwardly and outwardly he may make himself destitute of everything, and then let him begin to journey along this heavenly path; for he will never be filled unless he first of all empty himself, and he will never lay his hand upon the riches of heaven unless he first let go the poverty which he holdeth. It is impossible for him to lay hold upon the one, unless he let go the other, especially as they are opposed to each other, and each of them when it draweth nigh destroyeth the other.

You have heard, dearest brothers, that at the voice of a single command, Peter and Andrew, leaving their nets, followed the Redeemer. They had seen him perform no miracles yet, they had heard nothing from him about the reward of eternal recompense; and yet at one command of the Lord they forgot what they seemed to possess. How many of his miracles do we see, with how many scourges are we afflicted, by how many harsh threats are we deterred, and yet we disdain to follow him when he calls? He who admonishes us about conversion already sits in heaven; he has already subjected the necks of the nations to the yoke of faith, he has already laid low the glory of the world, he already announces, as its ruins multiply, that the day of his strict judgment draws near; and yet our proud mind does not wish to abandon willingly what it loses daily against its will. What then, dearest ones, what shall we say at his judgment, we who are neither bent by commands nor corrected by blows from the love of the present age? But perhaps someone may say to himself in silent thoughts: At the Lord's voice, what or how much did each of these fishermen leave behind, who had almost nothing? But in this matter, dearest brothers, we ought to weigh the affection rather than the wealth. He left much who retained nothing for himself; he left much who, however little it was, abandoned everything. Certainly we both possess what we have with love, and seek from desire those things we do not have at all. Therefore Peter and Andrew left much, since each also abandoned the desires of having. He left much who renounced his longings along with the thing he possessed. Therefore those who followed gave up as much as could be desired by those who did not follow.