The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
数学家研究纯数学不是因为它有用；他研究它是因为他喜欢它，他喜欢它是因为它美丽。
"I think the mind is the most important thing in any sport. If you can control your mind, you can control the situation."
The only way to achieve the impossible is to believe it is possible.
You are the only real obstacle in your path to a fulfilling life.
Don't watch the clock; do what it does. Keep going.