John Chrysostom
Thus, the Redeemer, aiming to illustrate that the act of fishing symbolizes the Church, sought to instruct Peter further and encouraged him by this demonstration, saying, "Fear not; from now on, you will catch men." By stating "from now on," He indicates that Peter has witnessed His power and recognized that even irrational beings respond to His command, and everything yields to His call. After providing such a compelling illustration, He encourages Peter to diligently pursue the souls of others. He did not imply that Peter would catch men as one would fish, but that he would catch them alive. Fish are captured alive only to be killed, whereas men are drawn away from death into life. "From now on," He declares, "you will catch men." Why then does the Redeemer reassure him with "Fear not"?
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This promise may have caused apprehension for Peter, reminding him of his past sins; thus, the Lord tells him to cast aside that fear, identifying himself not as a sinner but as an apostle, committed to obey the Lord’s command to gather the entirety of creation. "Fear not," let every sinner hear from Christ, "Fear not," provided he repents from this moment forward. The net symbolizes the life-giving teachings of the Saviour.
The Sole Lawgiver of the Old and New Testaments stated to Simon: "I will leave your vessel, Simon, I am departing, but I will enter into you, for this is the purpose for which I came. In the act of catching fish, you have also been caught; you have endured what you perform. You draw from life to death, while I draw from death to life. ‘Fear not; from now on, you will catch men.’ Abandon the lake and embrace the world; break the staff and take up the cross; shatter the rod and proclaim righteousness; cast the hook and bring healing to the ailing; open the nets and provide access to the keys of heaven; depart from the boat and immerse yourself in the Church. ‘Fear not, Simon, from now on, you will catch men.’ Oh, the might of the Lord!