"There is no sun without shadow, and it is essential to know the night."

Nature hath made men so equal in the faculties of body and mind， as that though there be found one man sometimes manifestly stronger in body or of quicker mind than another， yet when all is reckoned together the difference between man and man is not so considerable as that one man can thereupon claim to himself any benefit to which another may not pretend as well as he.

The key to solving complex problems is to ask the right causal questions.

人经常被真相困扰。但是大多数人装作没看见就走了。

你必须写那本想要被写出来的书。如果这本书对成年人来说太难，那么你就为孩子们写。