I am an early riser,' he says at last. 'So I watch Owen wake up every morning. And each morning reveals something new. The light catches his face in a particular way; he has a fresh thought; he shares a memory. Love is finding one person infinitely fascinating.' John seems lost in thought again - then comes to. 'And so... not an achievement, my dear.' He gives me a mild, kind smile. 'Rather, a privilege.