规律

“知常曰明。不知常，妄作，凶”
（知道规律，叫作明智。不知道规律，轻取妄动，其结果必凶）
所谓“常”，就是“道”，就是欲取先予，
欲张反敛，以反达正等谋略，老子深为谙之。
"Know often said. I do not know for atmospheric, unwisely, fierce "
(know law, is wise. Don't know the rules, posted a reckless actions,
the result will be fierce)
the so-called "ordinary", "road", that is to take back the advance,
Zhang divergence to reach positive strategies, Laozi was excellent.