#Energy.
There was a crucial step forward in my thinking, at some point—one of those quantum leap thingummies, you could say—after which I realized that the loosey-goosey talk about "raising energy" which I'd encountered in the 1999-2001 (ish) Seattle pagan community wasn't nonsense. There were genuine exchanges of physical energy, dimly perceived by the magical practitioner.
I remember being new to such talk, as a curious student of the occult wandering in from a very different region of the academic community. I was an obnoxious Berdly-ish science geek at one time. Subsequent encounters with fantasy and #magic had given me a different perspective perhaps, but the science-geek tendencies were still quite strong in those early pagan years. I was irritated with how all those earnest but dopey white Seattle Wiccans talked about "energy" and "vibrations", even though it turns out they did touch upon the truth.