Friendship, you know, is as mysterious as love or any other state of this confusion that we call life. In fact, I have sometimes suspected that the only thing that holds no mystery is happiness, because it is its own justification. — Jorge Luis Borges, from “Unworthy,” Brodie’s Report. Translation by Norman Thomas di Giovanni & Jorge Luis Borges. (Penguin Classics, July 26, 2005) Originally published 1970.