What it means?

Atoms are not discrete balls floating in space. They are more point-like excitations of a field. (Think of standing waves in a body of water.)

There are no discrete things or objects of solid substance; things as we perceive them are merely changing forms and patterns in nature (the universe) as a whole. You are not a small and lonely being lost in a foreign universe; you are a direct expression of the whole of the universe as it currently is; you (as everything else) is a brief movement in the dance of nature. You do not exist independent of the perceived outside; outside and inside are two sides of the same coin.

The seed is no different from the tree. They are the same thing viewed from different perspectives in time. Birth and death are really no different; waking life is really no different from dreamless sleep.

The nature of the human perspective is experience. This is why we say that we are the universe experiencing itself: A dark cloud is the universe clouding itself; the sun is the universe lighting itself; the rotating planet is the universe spinning itself.

The ocean waves; the planet rotates; the sun shines; the heart beats; the stomach digests; the brain thinks; the body acts. These events are no different in nature. The thinker of thoughts is the waver of oceans, not a little man behind the eyes of the body; the waver of the ocean is spontaneous, as is the thinker of thoughts. Nature is not being moved; nature flows without direction; nature is not concerened with tomorrow, for it is dancing today.

Look at a tree, see how it moves in the wind.

Notice your thoughts arising, even the thought "I am thinking."

Notice that the movement of the tree and the movement of thought are two expressions of the same thing.

Stop labeling the tree and yourself; notice that all separation is a consequence of the labeling process; allow all boundaries to dissolve.

Feel the swaying of the tree as much as you feel the arising thoughts and the other bodily sensations.

Feel intuitively that what you refer to as I is a form in the universe experiencing itself.