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Happiness is the key to life. Without happiness, you have nothing.
"The world is full of obvious things which nobody by any chance ever observes."
The value of a thought is in its consequences for behavior.
科学是一种试图不欺骗自己的方式。首要原则是你不能欺骗自己,而你自己是最容易被欺骗的人。
进步的真正衡量标准不在于知识的积累,而在于其应用于人类的改善。
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.