The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.

I want my books to be a mirror, not a window.

I'm not a role model. I'm a father, a husband, a son, a brother, a friend. I'm a human being. I make mistakes. I have flaws. I'm not perfect. But I try to be the best person I can be.

"Writing is an act of courage - to put your inner world on display."

Art is a way to give form to the invisible.

《三民主义·民权主义·第一讲》（1924年3月9日）