The best mathematics is timeless.

古代著书立说的人，都是有所为而为之，不是随便写写的。

The difference between a good business and a bad business is that good businesses throw up one easy decision after another. The bad businesses throw up painful decisions time after time.

The Internet is a powerful tool for education, communication, and collaboration.

现象学还原不是对世界的否定，而是对我们自然态度的悬置。