It was in the autumn of 1957. Albuquerque New Mexico. The desert still stretched out across the feet of mountain ranges and went on into a blue infinity. I fetched the day's mail. A Wedgewood blue envelope stuck out from the heap. It was marked Cavendish Close Saint Johns Wood London as I remember. I opened it and found these words among the many in the letter it contained - '...for vision, you see, must always outstrip any possible achievement.'