The key to success is to focus on goals, not obstacles.

一本书是由一个词开始的旅程。

Every aspect of learning or any other feature of intelligence can in principle be so precisely described that a machine can be made to simulate it.

I'm not afraid to fail, I'm afraid not to try.

If we don't believe in freedom of expression for people we despise, we don't believe in it at all.

成功不是终点，失败也并非致命，重要的是继续前进的勇气。