If you don't, you separate things into ten thousand classes and one thousand levels. If you do, you understand the ten thousand classes and one thousand levels. If you don't, you have an attachment to One. If you open your mouth and say you understand, I will hit you thirty times. And if you say you don't understand I will still hit you thirty times.
Spring air fills the universe and flowers are blossoming everywhere.
If you proclaim this, you shut the mouths of all Buddhas and all eminent teachers. To hear what they say, you must understand what sitting Zen is. When you are able to stay perfectly clear by cutting off all thinking and yet not falling into a trance-like sleep, this is sitting. When inside and outside become one, and no circumstances can hinder you, this is Zen. When you understand sitting Zen, you understand yourself.