你不应该认为对你来说难以掌握的东西是不可能的，如果是人类可以实现的，就应该认为它是可以实现的。
You must not think that what is hard for you to master is humanly impossible； and if it is humanly possible， consider it to be within your reach.
I'm not afraid of storms, for I'm learning how to sail my ship.
一门科学的历史就是它的问题域的历史。
The world is full of people who have dreams and the world is full of people who have ideas, but the world is also full of people who never do anything about them.
当我们爱的时候，我们总是努力变得比现在更好。