"Privratnik" ("The Gatekeeper"), by NICHOLAS ROERICH

"Gatekeeper, tell me, why are you closing this door ?
What are you guarding so staunchly ?"
"I am guarding the secret of quietude".
"But quietude is empty. Reliable people
 say there is nothing in it."
"I know the secret of quietude.
I am placed to guard it."
"But your quietude is empty !"
"It is empty to you,"
replied the gatekeeper."