外交是一种手段，而不是目的。
Diplomacy is not an end in itself if it does not advance the interests of the nation.
Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
我们无法不了解历史。
【大意】太阳不知道黑夜的情况，月亮不了解白昼的景象，太阳与月亮都有光亮可以照明，却不能兼知黑夜与白昼的情景。