《资治通鉴·汉纪·汉纪二十》
所以颁布命令，如同返汗；任用贤能，却跟转石头一样容易。而排除邪恶，简直象拔起一座大山一样困难。在这种情形下，希望阴阳调和，不也是很困难的吗？
故出令则如反汗，用贤则如转石，去佞则如拨山，如此，望阴阳之调，不亦难乎！
So issuing an order is like sweating; employing competent people is as easy as turning a stone; while eradicating evil is as difficult as pulling up a big mountain. Under such circumstances, isn't it too difficult to expect the balance of Yin and Yang?