Now when He had left speaking, He said unto Simon, Launch out into the deep, and let down your nets for a draught. – Luke 5:4

A fisher is a person who is very dependent, and needs to be trustful. He cannot see the fish. One who fishes in the sea must go and cast in the net, as it were, at a peradventure. Fishing is an act of faith. I have often seen in the Mediterranean men go with their boats and enclose acres of sea with vast nets; and yet, when they have drawn the net to shore, they have not had as much result as I could put in my hand. A few wretched silvery nothings have made up the whole take. Yet they have gone again and cast the great net several times a day, hopefully expecting something to come of it. Nobody is so dependent upon God as the minister of God. Oh, this fishing from the Tabernacle pulpit! What a work of faith! I cannot tell that a soul will be brought to God by it. I cannot judge whether my sermon will be suitable to the persons who are here, except that I do believe that God will guide me in the casting of the net. I expect Him to work salvation, and I depend upon Him for it. I love this complete dependence, and if I could be offered a certain amount of preaching power, by which I could save sinners, which should be entirely at my own disposal, I would beg the Lord not to let me have it, for it is far more delightful to be entirely dependent upon Him at all times. It is good to be a fool when Christ is made unto you wisdom. It is a blessed thing to be weak if Christ becomes more fully your strength. Go to work, you who would be fishers of men, and yet feel your insufficiency. You that have no strength, attempt this divine work. Your Master’s strength will be seen when your own has all gone. A fisherman is a dependent person, he must look up for success every time he puts the net down; but still he is a trustful person, and therefore he casts in the net joyfully.

May the Lord Jesus make us hard-working, persevering, unwearied fishers of men! “In the morning sow thy seed, and in the evening withhold not thine hand; for thou knowest not whether shall prosper, either this or that.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1906.cfm