Among things that have form, the great must originate from the small; among things that endure long, the multitude must originate from the few. Therefore Laozi says: 'The difficult affairs of All-Under-Heaven must begin from the easy; the great affairs of All-Under-Heaven must begin from the minute.' Thus one who wishes to control things must attend to the minute. Therefore: 'Plan for the difficult while it is still easy; accomplish the great while it is still small.'
A dike of a thousand spans can be breached by a mole-cricket's hole. A house of a hundred paces can be burned by a spark from a chimney crack. Thus Bai Gui, when inspecting dikes, sealed every hole; the old man, when guarding against fire, plastered every crack. Therefore Bai Gui suffered no floods and the old man suffered no fires. These all attended to the easy in order to avoid the difficult, and respected the small in order to forestall the great.
Bian Que visited Lord Huan of Cai and stood before him for a moment. Bian Que said: 'My lord, you have an illness in the pores. If not treated, I fear it will go deeper.' Lord Huan said: 'I have no illness.' Bian Que departed. Lord Huan said: 'Physicians love to treat the healthy and claim credit for it.'
After ten days, Bian Que visited again and said: 'My lord's illness is in the flesh. If not treated, it will go deeper still.' Lord Huan did not respond. Bian Que departed. Lord Huan was again displeased.
After ten days, Bian Que visited again and said: 'My lord's illness is in the stomach and intestines. If not treated, it will go deeper still.' Lord Huan did not respond. Bian Que departed. Lord Huan was again displeased.
After ten days, Bian Que gazed at Lord Huan from a distance and turned to flee. Lord Huan sent someone to ask why. Bian Que said: 'When the illness is in the pores, hot compresses can reach it. When in the flesh, acupuncture needles can reach it. When in the stomach and intestines, herbal decoctions can reach it. When in the bone marrow, it belongs to the Arbiter of Fate -- nothing can be done. Now it is in the bone marrow; therefore I make no further requests.'
After five days, Lord Huan's body was wracked with pain. He sent men to find Bian Que, but he had already fled to Qin. Lord Huan thereupon died.
Thus a good physician attacks illness at the pores. These are all cases of contending over what is small. The fortune and misfortune of affairs likewise have their 'pore stage.' Therefore the sage attends to matters early.