Never stop learning because the world never stops changing.
永远不要停止学习，因为世界永远不会停止变化。
What we see is not simply given but actively constructed through complex processes.
Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
书籍是心灵的窗户，透过它们我们可以看到更广阔的世界。
The body forgets, but the soul remembers.