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.
Quality is not a position; it is a practice.
The art of doing mathematics consists in finding that special case which contains all the germs of generality.
暴风雨过后,天空更晴朗。