John 1:50

Jesus replied that Nathanael had not seen anything yet. This demonstration of supernatural knowledge was small compared to what Nathanael would see if he continued to follow Jesus as his rabbi (John 1:49). This straightforward Jew had believed that Jesus was the Messiah because of very little evidence. Jesus would give him a more solid basis for his faith in the future (cf. John 20:29). John did the same for his readers by recording several of these "greater things" in the chapters that follow.