In this chapter, very helpful in showing faith, I am going to specifically refer to what Jesus wanted to show his disciples.
Peter's doubts about Jesus' abilities as a fisherman become doubts about himself. The first one is defeated by a miracle; the second is overcome by a promise.
The Greek word for fisherman means "catch something alive", and his verbal tense suggests continuous action. From now on, Peter and the others "will catch humans for the kingdom of God ..
God multiplies your seed so that you have even more than what you need.
Jesus taught a great lesson, about the sowing of the seed and the importance of sowing in good soil, then as if to illustrate, he told this group of tired and discouraged fishermen to throw with faith the net for a miraculous capture of fish.
These men had just planted their boat as a seed in the ministry of Jesus. They had given Jesus, his greatest possession, as a platform from which he could preach the gospel. They had served Jesus' greatest need at that time, and Jesus responded to their need.
As professional fishermen, they had the need to fish in order to earn a living and the daily sustenance of their families. They also needed to see God at work in their lives, that is, to see that Jesus was who he claimed to be, and that his faith was working effectively. Jesus responded to both needs!
When you give something to God He returns it multiplied; and, moreover, he will do it with all his grace and power.