So it was, as the multitude pressed about Him to hear the word of God, that He stood by the Lake of Gennesaret, and saw two boats standing by the lake; but the fishermen had gone from them and were washing their nets. Then He got into one of the boats, which was Simon’s, and asked him to put out a little from the land. And He sat down and taught the multitudes from the boat. When He had stopped speaking, He said to Simon, “Launch out into the deep and let down your nets for a catch.” But Simon answered and said to Him, “Master, we have toiled all night and caught nothing; nevertheless at Your word I will let down the net.”
And when they had done this, they caught a great number of fish, and their net was breaking. So they signaled to their partners in the other boat to come and help them. And they came and filled both the boats, so that they began to sink. When Simon Peter saw it, he fell down at Jesus’ knees, saying, “Depart from me, for I am a sinful man, O Lord!” For he and all who were with him were astonished at the catch of fish which they had taken; and so also were James and John, the sons of Zebedee, who were partners with Simon. And Jesus said to Simon, “Do not be afraid. From now on you will catch men.” So when they had brought their boats to land, they forsook all and followed Him. (Luke 5:1-11)
St. Gregory the Great comments:
“You have heard, my friends, that at a single word Peter and Andrew left their nets and followed Jesus. They had not seen him perform any miracles yet, and they had not heard him saying anything about eternal recompense, but at a single command from the Lord they forgot all their possessions.
You may be thinking that these two fishermen possessed almost nothing, and so you ask how much did they have to give up? In this case, my friends, it’s the natural feelings and not the amount that we have to weigh. Those who have kept back nothing for themselves have left a great deal; those who have abandoned everything, no matter how little it may be, have left a great deal. We are attached to what we have and hold on to it; we long for what we do not yet have and try to get it. When Peter and Andrew renounced their desire to possess, they gave up a great deal; along with their possessions they renounced even their craving to possess. Those who imitate them give up as much, then, as those who do not imitate them crave to possess.
Don’t ever say to yourselves, when you think of people who have given up a great deal, “I want to imitate them, but I have nothing to give up.” If you renounce your desires, you are giving up a great deal. No matter how little they may be, our external possessions are enough for God. He weighs the heart and not the substance, and measures the effort it costs us and not the amount we sacrifice to him. If we consider only the external substance, we see that these astute businessmen, Peter and Andrew, traded their nets and their boat for the fullness of life!” (Be Friends of God, pp. 26-27)