What is separation by density?

“So this is death,” I recall saying to one of the Sisters who was beside me―“Life separated by density―that is all.” 

Elation filled me. I knew now that I could ‘tune in,’ and even ‘see’ the earth plane if desire was strong enough to loosen the barrier between your world and my new one. The possibility rested with me. This, I realised, was my first lesson.

Now I dwelt in a realm of thought, and such thought power, when rightly implemented, can penetrate the dense plane, which is the world of human habitation.

I did not feel that I had really gone away into a far country―I could still keep in touch.

―Spirit Sister Frances Banks