重要的不是你说什么，而是你做什么。
"It's not about what you say, it's about what you do."
With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how.
"Matching methods can be a powerful tool when randomization is not possible."
Truth is often buried in profound silence.
实现不可能的唯一方法就是相信它是可能的。