Science should serve humanity, not the other way around.

把你的伤痛转化为智慧。

——《中国人之直言》（1920年4月3日）

"I am not a body, I am a word."

The time of life is limited and unchangeable, so it is necessary to use every minute efficiently. Not using it well is a waste.

生命中最美的事物是免费的。