Luke 5:6

They. That is, Peter and Andrew. James and John apparently continued to set their nets in order on the shore of the lake (see v. 7).

A great multitude. Earlier they had been able to catch nothing; now they were cooperating with Jesus, and their success exceeded their fondest expectations. Even as Christ, when living as a man among men, did nothing of Himself (see John 5:19, 30; 8:28), so those who would follow Him to become fishers of men must learn that without Him they can do nothing (John 15:5). It is only when divine power is combined with human effort, particularly in the work of fishing for men, that results can be effective and permanent. Compare the multitude of fish caught under similar circumstances about a year and a half later (see John 21:11).

Brake. Peter and Andrew were in danger of losing their great catch of fish. The fact that the net began to break implies that this catch of fish was unusual at any time, particularly by day. Here was evidence of divine power that could not be questioned, evidence that would impress other fishermen along the shore.