I’m not sure what Jesus taught on that day. It may have been the parable of the soils. You know, the one where the farmer scatters seed and some of it falls on the path, some of it on the rocks, and some among thorns. Of course, some seed does fall on good soil. Luke doesn’t place that parable here at the shore (Luke 8:4ff.), but Matthew and Mark do (Matt. 13:1ff.; Mk. 4:1ff.). So, maybe Peter overheard that story. Maybe not -- at least not at this point.
If he did happen to listen, he must have heard something. But he never expected to hear what Jesus said next. After the teacher was finished teaching, he turned to Peter and said, “Put out into deep water, and let down the nets for a catch.”