If pushed too far, the quest for a “Supreme Self” can blur into the most ancient human temptation, the whisper in Eden that “ye shall be as gods.”
But the strictures that orthodoxy places on its mystical seekers, […] they’re a useful reminder that the promptings of one’s inner self aren’t necessarily identical to the promptings of the Holy Spirit. Sometimes the God Within isn’t God at all, but just the ego or the libido, using spirituality as a convenient gloss for its own desires and impulses.
—from Bad Religion: How We Became a Nation of Heretics by Ross Douthat, Ch. 7: The God Within