This is he of whom I said, 'After me comes a man who is preferred before me, for he was before me.'

 In a great piece of music the composer often begins by stating the themes which he is going to elaborate in the course of the work. That is what John does here. Life and light are two of the great basic words on which the Fourth Gospel is built up. They are two of the main themes which it is the aim of the gospel to develop and to expound. Let us look at them in detail. 