关于神，我无法知道他们是否存在或他们是什么样的，因为这个问题太晦涩，而人的生命又太短暂。
Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be, because of the obscurity of the subject, and the brevity of human life.
数学的进步是通过概括实现的。