When you are thinking, your mind and my mind are different. When you cut off all thinking, then your mind and my mind are the same. If you keep "don't know" mind one hundred percent -- don't know -- at that time, your "don't know" mind, my "don't know" mind, everbody's "don't know" mind are the same. "Don't know" mind has already stopped thinking. Stopped thinking means no thinking. No thinking means empty mind. Empty mind means before thinking. Your before thinking is your substance. My before thinking is my substance (hits his chest). This stick's substance, universal substance, everything's substance, is the same substance.
So, when you keep "don't know" mind one hundred percent -- don't know -- at that time you are the universe, the universe is you. You and everything have become one. That is, as we say, primary point. So, "don't know" is not don't know, "don't know" is primary point. Primary point's name is "don't know." Some people say primary point's name is mind, or Buddha, or God, or nature, or substance, or absolute, or energy, or holy, or consciousness, or everything. But true primary point has no name, no form, no speech, no word, because it is before thinking. Only when you keep a "don't know" mind one hundred percent -- don't know -- at that time you and everything have already become one. So I ask you, when you keep "don't know", at that time, are this stick and you the same or different?.... If you say "the same", I will hit you thirty times. If you say "different", I will still hit you thirty times. Why?
The mind that becomes one with the universe is before thinking. Before thinking there are no words. "Same" and "different" are opposite words; they are from the mind that separates all things. That is why I will hit you if you say either one.....
You asked why I use words to teach if understanding through words is impossible. Words are not necessary. But they are very necessary. If you are attached to words, you cannot return to your true self. If you are not attached to words, soon you will attain enlightenment. So if you are thinking, words are very bad. But if you are not thinking, all words and all things that you can see or hear or smell or taste or touch will help you. So it is very important to cut off your thinking and your attachment to words.
Here is a poem for you:
Buddha said all things have Buddha-nature.
Joju said the dog has no Buddha-nature.
Which one is correct?
If you open your mouth, you fall into hell.
Clouds float up to the sky;
Rain falls down to the ground.