In verse 16 we see a familiar verse. 

Jesus asks Simon and Andrew to come with Him and he will make them "fishers of men". And without them realizing it, He is showing them how it can be done. 

One thing beginning fisherman do often is fish too fast. The fish often need time to look at what they are about to take a hold of. And it is no different with these two.You have to remember that it was not a perfect stranger who came up to a couple of workmen and commanded them to drop everything and follow him. Simon Peter and Andrew had been influenced by John the Baptist. John had pointed Jesus out to Andrew and another man and had said, “Look, the Lamb of God.” Andrew and his friend were so struck by John’s words that they began to walk a little way behind Jesus, following him. This is what happened next.

“Turning around, Jesus saw them following and asked, ‘What do you want?’ They said, ‘Rabbi’ (which means Teacher), ‘where do you live?’ ‘Come,’ he replied, ‘and you will see.’ So they went and saw where he was staying, and spent the day with him”

                                                                                                                                        John. 1:39

 

After he had said goodbye to Jesus, Andrew went to his brother Simon and said to him, “We have found the Messiah,” and he brought Simon to Christ. This happened a year before Jesus came walking towards these brothers as they worked at their boats by the Sea of Galilee.

These brothers had been prepared for this encounter by the ministry of John the Baptist. They had had a whole year to hear and observe Jesus, to question him and mull over his answers. They had heard his preaching to the crowds. So when Jesus came to them at the side of the Galilean lake and invited them to follow him it was not a leap in the dark. They had thought about him for twelve months. In fact there was scarcely anything else they had talked about – this extraordinary Jesus from Nazareth. So his invitation to them to follow him was preceded by observation, information, knowledge and a heavenly revelation that he had given to them.