You do understand it. That's what mysticism is. An expression of what can't be understood or be put into words. It's not something you can talk about.

And that's what the ending is trying to express, the mystic experience of oneness with God, etc. To end suffering, misunderstanding, achieve perfection and harmony, yadda yadda

Parmenides is another source for this sort of thing, outside of religion.

I read it as a pastiche, personally. It's like various mystic traditions and teachings, all slapped up together, hence the references to christianity, buddism, and kabbalah. It doesn't coherently try to articulate any one particular variety of mysticism.