The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

你越是对自己的过去和现在负责，就越能创造你想要的未来。

解析：经常反省检查自己，不给私欲留空间。

当你不再担心别人怎么想的那一刻，你就自由了。

我不相信运气，我相信努力。

No matter what anybody tells you,words and ideas can change the world.

测量地球是地理学的基础。