If you can see intention, then you need not use speech to communicate. The sage does not need to talk to people to understand their intent. Moreover, they do not need to use words to communicate their own intent. This is called saying nothing.

The enlightened person can also sense the truth without going through deduction or reasoning. This is called knowing nothing and yet knowing all.

Nan-kuo-tzu appears as if he does not see, does not hear, and does not know. However, he sees all, hears all, and knows all. For him, there is no separation between seeing and not seeing, hearing and not hearing, acting and not acting, and knowing and no