学习数学的唯一方法就是做数学。

这句话其实是莎士比亚借哈姆雷特之口说的，但是霍金非常喜欢，曾在自己著作中多次引用，所以很多人误以为本句话是霍金说的。

解释：所谓美的东西，无论在上下、内外还是远近，都不会产生危害，所以才叫做美。

"A book is a journey that begins with a single word."

Successful people maintain a positive focus in life no matter what is going on around them. They stay focused on their past successes rather than their past failures, and on the next action steps they need to take to get them closer to the fulfillment of their goals rather than all the other distractions that life presents to them.