数学中的每一个问题都是学习新东西的机会。
Every problem in mathematics is an opportunity to learn something new.
To be forgiven is only half the gift. The other half is that we also can forgive.
The eyes which are the windows of the soul.
书籍可能是危险的。最好的那些应该被贴上“这可能会改变你的人生”的标签。