数学中最重要的是理解概念，而不仅仅是记忆公式。

"Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."

阅读是借用；写作是偷窃并据为己有。

关于未来，我们唯一能确定的就是它会有所不同。

To write a good love letter， you ought to begin without knowing what you mean to say， and to finish without knowing what you have written.