Rule of 7 in research. You can find out anything if you are willing to go seven levels. If the first source you ask doesn’t know， ask them who you should ask next， and so on down the line. If you are willing to go to the 7th source， you’ll almost always get your answer.

书籍是很好的礼物，因为它们里面包含了整个世界。

当你在一生中做某事做到最好时，你真的不想放弃——对我来说就是网球。

Life is 10% what happens to you and 90% how you react to it.