能源革命的核心是清洁高效，煤炭行业必须主动适应这一趋势。

作家是由他的主题选择的——他的主题是他所处时代的意识。

The individual has become a mere cog in an enormous organization of things and powers which tear from his hands all progress, spirituality, and value in order to transform them from their subjective form into the form of a purely objective life.

书籍是最好的老师。

The art of doing mathematics consists in finding that special case which contains all the germs of generality.

解释：脚力不强劲，行程就不会远；刀刃不锋利，割东西就不会深。