书籍是最安静、最恒久的朋友;它们是最易接近、最睿智的顾问,也是最耐心的老师。
预测未来的最好方法是创造未来。
获得自由的唯一途径就是保持诚实。
The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.
The past is always tense, the future perfect.