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.
爱因斯坦当他说“上帝并不掷骰子”的时候是错误的。思考到黑洞的因素,上帝不仅仅仅玩骰子,他还经常把他们扔到我们看不到的地方来使我们迷惑。