People can be divided into these types: strangers, acquaintances, familiar people, friends, and close friends. True friendship isn't about compliments to your face, but whether you're mentioned when they talk about friends behind your back.

【讲解】：仁，距离我远吗？只要我想要做到仁，仁就随着心念到了。

可持续性不是一种趋势，而是负责任商业的未来。

译文：凡是说祸福，是靠自己求来的，就是圣贤之言。若是说祸福，是靠上天决定的，就是庸俗之言。

研究成功的关键是专注于具有长期影响的基础问题。