If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
It is only shallow peoplewho require years to get rid of an emotion. A man who is master of himself, can end a sorrow as easily as he can invent a pleasure.
你在生活中能走多远取决于你对年轻人温柔，对老年人富有同情心，对奋斗者感同身受，对弱者和强者宽容。因为在你的生活中，总有一天你会成为所有这些。
The best science is done with both the head and the heart.