Using plainer language, it is really just a fancy way of saying that there is an ultimate cause-like thing in the sense that clearly forms exist, rather than nothing existing, so we may as well name it “the source” because that is more descriptive than more flowery names like Brahman or Tao. (Also, the term God is misleading because usually people associate it with a particular form, but the source cannot have a form because then there would be need to be a cause for that form!)

This might seem like abstract philosophy, but believe it or not it is actually directly relevant to you personally! You already know all of this intuitively because you are aware of the fact that you are aware, which means that you are directly aware of the existence of the source—in fact, in a way, you are already in union with the source of reality, because the whole point of the source is to make things exist rather than not existing, and at the core of your experience you are something that exists.

The reason why you might not appreciate this is because you (like me, and most other people) probably spend most of your time focused outward on the objects in your awareness, rather than on your awareness itself. However, it turns out that there is a lot of happiness and wisdom that can be gained by spending time practicing being consciously aware of the feeling of being aware; at the very least, I think it is really exciting to play with trying to connect more with the ultimate reality at the core of my being to gain intuition about the nature of reality! 😀 As a caveat, though: it’s actually surprisingly tricky because it is hard to consciously change your focus to the feeling of being aware of being aware, so if you want to play with this then you need to be relaxed and watchful to create the conditions under which this can happen spontaneously.