积极思考的力量是在环境中没有任何支持的情况下，在自己身上产生一种确定感的能力。
The power of positive thinking is the ability to generate a feeling of certainty in yourself when nothing in the environment supports you.
写文章必须追溯六经的源头，并参考诸子百家和史书的写法。
——《致鲁赛尔函》（1906年11月8日）
True wisdom lies in admitting one's ignorance.
My legacy is to be the voice of a generation and change the way people think.
The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.