Thingness and no-thingness

In reading Eckhart Tolle's book this morning - A New Earth - these two words, these concepts came up. They are hard to grasp, I think.

Tolle writes: (spacing is mine)

Just as space enables all things to exist, and
just as without silence there could be no sound, 
you would not exist without the vital formless dimension that is
the essence of who you are.

We could say "God" if the word had not been so misused.
I prefer to call it Being.
Being is prior to existence.
Existence is form, content, "what happens".
Existence is the foreground of life; Being is the background, as it were.

...

Here are the two dimensions that make up reality, thingness and no-thingness, form and the denial of form, which is the recognition that form is not who you are.

Munching...space enables all things to exist...without silence there could be no sound...wow! And of course, the other concepts in there, are...well, you know...deep?

He has already preceded these with:
The collective disease of humanity is that people are so engrossed on what happens, so hypnotized by the world of fluctuating forms, so absorbed in the content of their lives, they have forgotten the essence, that which is beyond content, beyond form, beyond thought. They are so consumed by time, that they have forgotten eternity, which is their origin, their home, their destiny. Eternity is the living reality of who you are.

Munching...Am I keeping time?...Am I making too much noise?...