Chapter 1, ‘My Lord and My God’ in John 20:30–31’, asserts that the cause, content, and consequences of belief all suggest that Jesus is God. In John 20:27–29, Thomas sees Jesus and calls him ‘my Lord and my God’. After Jesus blesses those who believe without seeing him, John claims that he has written down signs in this book so that his readers can come to believe that ‘Jesus is the Christ, the Son of God’ and ‘receive life in his name’ (John 20:30–31). The proximity of both statements is not coincidental but reveals that 20:30–31 describes the same fullness of belief as Thomas’s exclamation. What emerges is that John’s portrayals of the ‘signs’, the titles ‘Christ’ and ‘Son of God’, and the resulting ‘life in his name’ are fundamentally theological. True belief will always make Thomas’s declaration.