数学不是沿着一条清理得很好的高速公路小心行进,而是进入一个陌生的荒野的旅程,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.
《诗经》三百篇,其内容可以用一句话概括:“思想纯正,没有邪恶。”
The greatest risk lies in not knowing what you're doing.