CHAPTER 27
--------Lao Zi
  Perfect activity leaves no track behind it;
Perfect speech is like a jade-worker whose tool leaves no mark.
The perfect reckoner needs no counting-slips;
The perfect door has neither bolt nor bar,
Yet cannot be opened.
The perfect knot needs neither rope nor twine,
Yet cannot be united.
Therefor the Sage
Is all the time in the most perfect way helping men,
He certainly does not turn his back on men;
Is all the time in the most perfect way helping creatures,
He certainly does not turn his back on creatures.
This is called resorting to the Light.
Truly,"the perfect man is the teacher of the imperfect;
But the imperfect is the stock-in-trade of the perfect man".
He who does not respect his teacher,
He who does not take care of his stock-in-trade,
Much learning though he may possess, is far astray.
This is the essential secret.

附原文：
善行无辙迹；善言无瑕谪；善数不用筹策；善闭无关楗而不可开；善结无绳约而不可解。是以圣人常善救人，故无弃人；常善救物，故无弃物。是谓袭明。故善人者，不善人之师。不善人者，善人之资。不贵其师，不爱其资，虽智大迷，是故要妙。