The famous Sufi master Rumi, who is very well known to most of you, has a story in which he talks of a man who goes to the house of a friend, and he knocks on the door, and a voice answers, "Who's there?"
スーフィの達人であるルーミーはご存知かと思いますが 彼が友人宅へ訪ねた男の話を聞かせるところがあります。 男はドアを叩きます。 すると声がして、「誰だ」と問う。