All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter into another.

集中的权力并不会因为创造它的人的良好意图而变得无害。

The language of mathematics is universal; it transcends all cultural barriers.

大陆漂移的第一个概念早在1910年就出现在我脑海中，当时我正在看世界地图。