Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.

The highest activity a human being can attain is learning for understanding because to understand is to be free.

The steel industry is a reflection of a nation's economic strength.

写作就像在雾中夜间驾驶。你只能看到车灯所及之处，但你可以这样完成整个旅程。