One of the previous possessors of the stone was Chuang Tzu. He had a disciple who spent seven years studying universal energy and then demonstrated his wisdom by walking across the surface of a river and back again, and Chuang Tzu broke into tears. 'Oh, my boy!' he sobbed. 'My poor, poor, boy! You spent seven years of your life learning to do that, and all the while old Meng has been running a ferry not two miles from here, and he only charges two copper coins.