Two men were walking along a crowded sidewalk in a downtown business area. Suddenly one exclaimed, "Listen to the lovely sound of that cricket!" But the other could not hear. He asked his companion how he could detect the sound of a cricket amidst the din of people and traffic. The first man...had trained himself to listen to the voices of nature, but he did not explain. He simply took a coin out of his pocket and dropped it on the sidewalk, whereupon a dozen people began to look about them.
"We hear," he said, "what we listen for."
~ Bhagwan Shree Rajneesh (The Discipline of Transcendence) ~