All we know is still infinitely less than all that remains unknown.
Prison life consists of routine, and then more routine.
《在广州石围塘检阅滇均的演说》（1924年4月4日）
I’m not afraid of making mistakes. I’m afraid of not trying.
解释：对于一件事情的利害得失，只有有智慧的人才能分辨清楚。