The mind is the most important thing in tennis.

The highest activity a human being can attain is learning for understanding because to understand is to be free.

No matter what you’re going through, there’s a light at the end of the tunnel.

"Silence is as important as the words we speak."

记忆力不是天生的，而是可以训练的。

The challenge in computer graphics is to simulate the complexity of the real world with the simplicity of mathematical models.