Were it left to me to decide whether we should have a government without newspapers, or newspapers without a government, I should not hesitate a moment to prefer the latter.

可持续性必须有利可图，否则就根本不可持续。

最小阻力和最少麻烦的路径是已经形成的思维定势。改变旧信念需要麻烦的工作。

定理是数学的里程碑。