Be scrupulously truthful, even when truth is inconvenient, for it is more inconvenient when you try to conceal it.
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.
The existence of the natural world is the same kind of fact as the existence of any proposition.
荒野是一个极端的地方。要生存，你必须接受高潮和低谷。