The best time to plant a tree was 25 years ago. The second best time is today.

 言辞和行动不是分离的，而是紧密相连的。

Every generation imagines itself to be more intelligent than the one that went before it, and wiser than the one that comes after it.

Confucious said that real knowledge is knowing the extent of one's ignorance.Aristotle and Socrates said the same thing.Is it a skill that can be taught or learned? It probably can, if you have enough of a stake riding on the outcome...