I believe it is Parmenides who said something along the lines that 'That which is, is, for it is or it would not be.' The answer to the question as to what is 'that which is' is Love, or, Eros as he called it. What it means is that Love is immaterial in nature but manifests itself as matter; matter is Love experiencing its manifest existency. Where do we draw the line between the unmanifest and the manifest, the immaterial and the material? We don't for these are abstractions. There is only Love. Love is who we are regardless of the state of manifestation. See yourself as Love; see all as Love for Love is the only thing here.
~ Wald Wassermann