I dont think there is anything on earth more wonderful than those wistful incomplete friendships one makes now and then in an hour's talk. You never see the people again, but the lingering sense of their presence in the world is like the glow of an unseen city at night—makes you feel the teemingness of it all.
John Dos Passos (1896–1970), U.S. novelist, poet, playwright, painter. Letter, December 9, 1917, to his friend Rumsey Marvin. The Fourteenth Chronicle: Letters and Diaries of John Dos Passos, ed. Townsend Ludington (1973).