"Where you have machines, then you get certain kinds of problems; where you get certain kinds of problems, then you find a heart warped by these problems. Where you get a heart warped, its purity and simplicity are disturbed. When purity and simplicity are disturbed, then the spirit is alarmed and an alarmed spirit is no place for the Tao to dwell. It isn't that I don't know of these machines, but I would be ashamed to use one."