自然法是自然教导所有动物的法则。

可持续发展不是选择，而是煤炭行业的必然要求。

良好的教养在于隐藏我们对自己较佳的评价，以及隐藏我们对他人较差的评价。

When a person realizes he has been deeply heard, his eyes moisten. I think in some real sense he is weeping for joy. It is as though he were saying, "Thank God, somebody heard me. Someone knows what it's like to be me."

学习数学的唯一方法就是做数学。

目标是灵魂。

Technology itself is neither good nor evil, the key lies in the people who use it.