你唯一的限制就是你自己设定的限制。
The only limits you have are the ones you set for yourself.
Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be. Many things prevent knowledge including the obscurity of the subject and the brevity of human life.
在数学中，提出问题的艺术必须比解决问题更有价值。
道的根本来源于天，如果天不改变，道也不会改变。
人情面子象水一样可分高下，世界上的事象天上的云一样变化无常。