Luke 5:1-11. When Peter saw the miracle of the catch of fish at Galilee, he knew he was a sinful man, in the presence of God. He initially tells the Lord to leave him, for he was yet to learn that the call is based on grace, not on merit. The miracle of the fish was also to demonstrate that catching men would also not be by his own wisdom, experience, or efforts alone, but would need the miraculous work of God.