The movement of people and ideas is ... more than useful; it is sacrosanct. It forms part of the process by which the whole human race becomes both one and diverse, and makes itself more godlike, by affirming in the individual as well as in the species, its preeminence over the particular social and cultural worlds that it builds and inhabits. Both the movement of people and the movement of ideas can unsettle and frighten us, driving us back into ourselves. They can also inspire us to reimagine and to remake our interests, our ideals, and even our identities, by beginning to detach them from the settings with which we habitually associate them. Each of them is therefore an invitation to open ourselves to the new, in a world in which every man and woman has a better chance to become the original that he imagines himself to be.