Love is of source unknown, yet it grows ever deeper. The living may die of it, by its power the dead live again. Love is not love at its fullest if one who lives is unwilling to die for it, or if it cannot restore to life one who has so died. And must the love that comes in dream necessarily be unreal? For there is no lack of dream lovers in this world. Preface to Mudan Ting (1598)