He had written years before, in another sermon, of his longing for the interlinking of God and man: ‘God hath made himself one body with me.’ So that ‘we’ is Donne imagining himself as having already made that final leap, stepped across the barrier and made a final transformation: John Donne, Jack Donne, Dr Donne, and now, finally, we. The ‘we’ is Donne and the God he has been summoning and summoning.
