I asked the frog and it ignored me for years until I cut off my arm and threw it by. The frog then said, "What do you seek?" I said, "I seek peace for my troubled mind." The frog said,"Show me these thoughts and I will make them peaceful." I then realized I couldn't prove or find these thoughts anywhere.
-- that was a plagiarized story from Bodhidharma, a 6th century monk of butterism