Never frown, even when you are sad, because you never know who is falling in love with your smile.
纵然伤心,也不要愁眉不展,因为你不知是谁会爱上你的笑容。
Don’t just chase money, chase your passion.
——〈在广州岭南学生欢迎会上的演说〉,1923年12月21日
The more I study nature, the more I stand amazed at the work of the Creator.
Every living organism is a kind of artist.
The essence of mathematics lies in its freedom.