It is the limitless substance of all of creation in which we are instinctively connected and therefore we our aware of it and can be revealed knowledge through. The more resistant you become through freewill the less aware you become and the more you try and stand on logic for your rationality of reality.
This is what Tesla called it.
Long ago he recognized that all perceptible matter comes from a primary substance, or a tenuity beyond conception, filling all space, the Akasha or luminiferous ether, which is acted upon by the life-giving Prana or Creative Force, calling into existence, in never ending cycles, all things and phenomena.
This is what Einstein called it
Einstein nodded: he was a good listener. After a pause he said, "The cosmic man must be restored, the whole man who is made in the image and likeness of the arch-force, which you may call God. This man thinks with his heart and not with party dogma. As I've explained before, there is an order in the universe a cosmic order and humans have the possibility of understanding these laws."
Einstein leaned back in his chair; so did I,putting my writing pad on my knees. He added, "I have no doubt that the allies will win the war."
I smiled, "Oh, you are my prophet again."
"Prophet or not," he scratched his head, "what I say is more often felt through intuition than thought through intellect."
They both understood this substance which the rest of science( except for those who are getting a grasp or intuitive sense of string theory) are missing the mark standing to much on logic and math equations which is not even lining up with reality.
I think Tesla grasped more of the truth than Einstein who still was hung a little in logic and not intuition.
Now I also believe in a creator of this substance and this substance is what God uses to sustain the universe. You might call it a form of energy but either way only a few great minds have come close to comprehending it and it's only because they were intuitive and had a connection with their instinct of truth and not relied solely on logic.