数学的本质不是使简单的事物复杂化,而是使复杂的事物简单化。
The whole art of teaching is only the art of awakening the natural curiosity of young minds for the purpose of satisfying it afterwards.
It's not always necessary to be better than everyone else, but to be better than you used to be.
You must be filled with expectancy. You must be awash in hope.