In John’s Gospel, we have a very particular phrase, as you will of course remember, for what are called miracles in the other Gospels. In John, we call them “signs.” ...

Recall the basic structure of John’s Gospel — after the Prologue, the Book of Signs (John 1-11) begins with the changing of water into wine at the wedding feast in Cana and each of these signs ...

The believers of John's community can see into this spiritual and redeeming cosmos; their opponents cannot. The opponents of Jesus are "the Jews", who cannot or will not recognize who he is.