诚恳：不要恶意欺骗人，思想纯洁公正，讲话也是如此。

The truth is rarely pure and never simple.

Man is defined as a human being and a woman as a female — whenever she behaves as a human being she is said to imitate the male.

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

【译文】 孔子说：“外表威严而内心怯懦的人，用小人作比喻，就象挖墙洞的小偷吧！”

An ounce of practice is worth more than tons of preaching.

科学是现实的诗歌。