Truth is a free creation of the human spirit, that never would exist at all if we did not generate it ourselves.

质量从来不是偶然的；它始终是智慧努力的结果。

每个故事都有开始、中间和结尾，但不一定是这个顺序。

The highest manifestation of life consists in this: that a being governs its own actions.A thing which is always subject to the direction of another is somewhat of a dead thing.

The people who are crazy enough to think they can change the world are the ones who do.

数学中最美丽的东西是复杂背后的简单思想。

The march of invention has clothed mankind with powers of which a century ago the boldest imagination could not have dreamt.

A book can be a quiet place in a noisy world.