——《中国人之直言》（1920年4月3日）

To eat bread without hope is still slowly to starve to death.

I don't have to prove anything to anyone. I only have to follow my heart and concentrate on what I want to say to the world. I run my world.

研究历史的人，贵在能够贯通古今的变化，探究天道与人事的关系。