望门投止思张俭，忍死须臾待杜根。
逃亡时想起张俭的遭遇，强忍濒死等待杜根般的转机。
I am always glad to think that my education was, for the most part, informal, and had its roots in the soil.
You can't change the past, but you can shape the future.
每张皮革都有潜力，我们的责任是负责任地发掘它。
解释：没有不犯错误的完人，只要能及时改正自己的错误，就是最好的了。
科学应该为人类服务，而不是反过来。