Before the Baal Shem Tov, people thought of G‑d as the One who directs all things from above and beyond. The Baal Shem Tov taught that the vital force of each thing, the place from which comes its personality, its sense of pain and pleasure, its growth and life—that itself is G‑d.
Not that this is all of G‑d. It is less than a glimmer of G‑d. Because G‑d is entirely beyond all such descriptions.
But that life force is G‑d as He is found within each creature He has made.
Tanya, part 2, chapter 1.