Dominica IV post Pentecosten: "Depart from me, for I am a sinful man, O Lord"

From the Holy Gospel according to Luke
Luke 5:1-11
At that time, while the crowds were pressing upon Jesus to hear the word of God, He was standing by Lake Genesareth. And He saw two boats moored by the lake, but the fishermen had left them and were washing their nets. And getting into one of the boats, the one that was Simon’s. He asked him to put out a little from the land. And sitting down, He began to teach the crowds from the boat. But when He had ceased speaking, He said to Simon, Put out into the deep, and lower your nets for a catch. And Simon answered and said to Him, Master, the whole night through we have toiled and have taken nothing; but at Your word I will lower the net. And when they had done so, they enclosed a great number of fishes, but their net was breaking. And they beckoned to their comrades in the other boat to come and help them. And they came and filled both the boats, so that they began to sink. But when Simon Peter saw this, 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 amazed at the catch of fish they had made; and so were also James and John, the sons of Zebedee, who were partners with Simon. And Jesus said to Simon, Do not be afraid; henceforth you shall catch men. And when they had brought their boats to land, they left all and followed Him.

Homily by St. Ambrose, Bishop of Milan.
Bk. iv. on Luke v.
When the Lord wrought so many works of healing, neither time nor place could restrain the people from seeking health. Evening came, and they still followed Him He went down to the lake, and they still pressed upon Him and therefore He entered into Peter's ship. This is that ship, which spiritually up to this very hour, according to the expression of Matthew, is buffeted by tempests, but still, according to Luke, is filled with fishes, this signifying, that, for a while, to labour is present to the Church, but, hereafter, it shall be to rejoice. The fishes are they which swim in the troublous waters of human life. In this ship also spiritually doth Christ, for His disciples, still sleep, and still command; for He sleepeth for the lukewarm, and watcheth for the perfect.