数学不是沿着一条清理干净的高速公路小心翼翼地行进，而是一次进入陌生荒野的旅程，探险者常常会迷路。
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 act of writing is an act of memory.
人类不仅是自然的产物，也是自然的改造者，常常带来不可逆转的后果。