Luk 5:6-8, 6 And when they had done this, they caught a great number of fish, and their net was breaking…8 When Simon Peter saw it, he fell down at Jesus’ knees, saying, “Depart from me, for I am a sinful man, O Lord!”
A certain centurion in Luke 7 called on Jesus to come and heal his servant but felt unworthy to have the Lord at his house. He did not first have the experience of a miracle to bring him to that level like Peter. Here, Peter’s experience or encounter with Lord with the miracle of great catch left him in awe. He was overwhelmed with the thought of his own little faith and unworthiness for such an awesome miracle done just for his sake. Perhaps some people present thought Peter deserved or was worthy of this miracle having lent the Lord his boat
The greater the miracle/blessings the greater it should drive us to feel unworthy of the favor of Christ and His presence. It is indeed a sign of humility on a believer’s part and like Peter to say “depart from me, for I am a sinful man, O Lord”. The worthiness of Christ exposes our unworthiness. Isaiah had a heavenly vision that elevated the worthiness of God in his sight which in turn exposed his unworthiness which brought about humility and submission.