你越深入数学，就越能意识到一切是如何相互关联的。
The night is a great theater, but the stars are its actors.
The source of all suffering is attachment.
如果战斗不可避免，先发制人。
出自先秦《荀子·劝学》。定居一定要选择适当的邻里，交游一定要接近贤士。说明要加强道德修养，就应该注意周围环境。