There is the Zen saying as follows; Nature and I have the same root. All things and I are ONE essentially. All things in nature of the world come back to "ONE" in the ultimate. World where "ONE" is limitlessly rich, there is the ground that is the miracle stage which does not have all boundary lines. Knowledge, the deep attachment that you accumulated so far may cost "ONE" without vanity. However, if you throw away them without any regret once, you may realize "ONE". Besides, even if you understand "ONE", you will be strongly admonished that you must not remain in "ONE" by the Zen teacher. OK, how do you have it afterwards?