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幸福并不容易。很难在我们内心找到它,更不可能在别处找到它。
Confidence is the key to everything.
The right of nature... is the liberty each man hath, to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.
The most important thing in science is not to solve problems, but to ask the right questions.