And Simon answering said unto him, Teacher, we have toiled all the night, and have taken nothing: nevertheless at your word I will let down the net.
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George Leo Haydock
Though these words of St. Peter seem to express his little hope of success, as he had been toiling (kopiasantes) the whole night, the most favourable time for fishing, yet they were intended by St. Peter to show his great confidence, that notwithstanding his bad success, he was willing to obey; he relied on his words, and let go his net in the same place where before he had been disappointed; and the event proved that the obedience and confidence of Peter were not in vain. (Maldonatus)