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人生沒有如果，只有結果和后果。

歌唱就是雙倍的祈禱。

The beauty of mathematics lies in its ability to describe the world in a precise and elegant way.

The only way to do great work is to love what you do.

Children totally accept — and crave — family rules. “In our family we have a rule for X” is the only excuse a parent needs for setting a family policy. In fact， “I have a rule for X” is the only excuse you need for your own personal policies.

So, I went through life constantly practicing this model of disciplinary approach. Well, I can’t tell you what that’s done for me. It’s made life more fun. It’s made me more constructive. It’s made me more helpful to others. It’s made me enormously rich.

In times of crisis, true leadership shines.

One way of looking at speech is to say that it is a constant stratagem to cover nakedness.