见可而进，知难而退

Explanation: Decide according to the actual attack and retreat. 　　Source: Han Xun Yue "Ji Han Ji Gaodi": "abroad against Zhao Bing, see can be forward, quit, pregnant with the care of the heart, the plan for no mortal." 　　Examples: Chen and smell the sage does not stagnate in the matter, ~, the rationale for a flexible, feeling no Juzhi. Song shaobo warm "smell op recorded" Juan Liu