Once Imam Khomeini told to one of his friends," pass me my glasses, please. I want to study". When I took his glasses from the table, I saw the dust over them. I took a Kleenex and cleaned the glasses and gave it to Imam Khomeini. When I decided to throw the Kleenex away, Imam Khomeini observed and said, "If you do not need that Kleenex, please gave it to me. I can use it for other purposes. It should not be thrown away".