This is a beautiful Zen story about the state of deep meditation in which mind gets dissolved in meditation that even meditation doesn’t exist at all, only remains nothingness.
Once Bokuju (Zen Monk) was meditating, meditating very deeply, meditating with his whole heart. His master would come every day, and he would just laugh and go back. Bokuju became annoyed. The master would not say anything, he would just come and look at him, laugh and go away. And Bokuju was feeling very good in meditation. His meditation was deepening, and he needed someone to appreciate him. He was waiting for the master to pat him and say, “Good, Bokuju. You did well.” But the Master just laughed. The laughter felt insulting — as if Bokuju was not progressing, and he was progressing. As he progressed more, the laughter grew more and more insulting. It was impossible to tolerate it now. One day the master came, and Bokuju was feeling absolutely silent as far as the mind can go; there was no noise within, no thought. The mind was absolutely transparent; no barrier was felt. He was filled with a subtle deep happiness, joy was bubbling all over, he was in ecstasy. Thus, he thought, “Now my master will not laugh. Now the moment has come, and he is going to tell me, `Now Bokuju, you have become enlightened.'”
That day the master came: the master came with a brick in his hand, and he started rubbing that brick on the rock on which Bokuju was sitting. He was so silent, and the rubbing of the brick created noise. He became annoyed.
At last, he couldn’t tolerate it, so he opened his eyes and asked his master, “What are you doing?” The master said, “I am trying to make this brick a mirror, and by continuously rubbing it I hope that someday this brick will become a mirror.” Bokuju said, “You are behaving stupidly. This stone, this brick, is not going to become a mirror. No matter how much you rub it, it is not going to become a mirror.” The master laughed and said, “Then what are you doing? This mind can never become enlightened, and you go on rubbing and rubbing it. You are polishing it, and you are feeling so good that when I laugh you feel annoyed.” And suddenly, as the master threw his brick, Bokuju became aware. When the master threw his brick, suddenly he felt that the master was right, and the mind broke. Then from that day on, there was no mind and no meditation. He became enlightened.
The master said to him, “Now you can move anywhere. Go, and teach others also. First, teach them meditation; then teach them non-meditation. First teach them how to make the mind clear, because only a very clear mind can understand that now even this clear mind is a barrier. Only a deeply meditative mind can understand that now even meditation has to be thrown.