Challenges are opportunities in disguise; embrace them with courage.
The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
在所有人类的痛苦中，最苦涩的是：知道得太多却无法控制任何事情。
No man really knows about other human beings. The best he can do is to suppose that they are like himself.
The tragedy of great power politics is that even well-intentioned states are forced to act in ways that can lead to conflict and war.