The Common Core (a.k.a. Common Core Thesis, a.k.a.) holds that "mystical experience is a universal phenomenon that is essentially the same for mystics from different traditions, even when it is interpreted differently."
This position, also known as “perennialism,” is associated with, among others, William James, Aldous Huxley, and Walter Stace.
- Jacobs, Bas J. H. “Getting off the Wheel: A Conceptual History of the New Age Concept of Enlightenment.” Numen 67 (2020): 373–401. p. 376.