最成功的现代国家是那些能够将强大的国家与法治和民主问责制结合起来的国家。
数学家研究纯数学不是因为它有用;他研究它是因为他喜欢它,他喜欢它是因为它美丽。
Every day is a new opportunity. You can build on yesterday's success or put its failures behind and start over again.
I think it's important to have a positive attitude and to be optimistic.