In this narrative St. Luke tells us how Peter and others were called to the Apostolic office. And, indeed, the narrative is very appropriate. For by the extraordinary draught of fishes the Lord wanted to show them how the Gospel would be spread in the world with great power, and would catch men who are in the kingdom of the devil and bring them into the kingdom 696of God. For at the close the Lord Himself interprets it, that Peter, Andrew, James and John, from hence forth, shall catch men.

This is a great comfort in the temptations to which all pious ministers of the Gospel are generally exposed. They are apt to suppose the world to be too wicked, that all preaching will be useless and in vain, and that nobody will be converted thereby. This, Christ wishes to say, may be expected from the preaching of Moses; but wherever my Word is preached at my command, it shall accomplish its end, as was the case with the draught of fishes, in which Peter was engaged at my command.

Before, however, the Evangelist begins his narrative, he states that a multitude of pious people followed the Lord Jesus and was anxious to hear Him preach.  By this example He would incite us also willingly to hear His Word and zealously to continue in it. For whoever hears the Word of God diligently enjoys two great advantages, which could never be enjoyed without that Word. (Luther’s House Postil, Sermon for the Fifth Sunday after Trinity, Volume 3, p. 695-696)