The secret of being miserable is to have leisure to bother about whether you are happy or not.  
痛苦的秘密在于有闲功夫担心自己是否幸福。
快乐的人不是没有痛苦，而是不会被痛苦所左右
The key to successful leadership today is influence, not authority.  如今，成功领导的关键是影响力，而非权力。