Play is the language of childhood, and books should speak that language too.
玩耍是童年的语言，书籍也应该用这种语言表达。
成功的关键在于预见市场趋势并果断行动。
If you are free, you are not predictable.
We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.
The most effective way to destroy people is to deny and obliterate their own understanding of their history.