"What is mysticism? Mysticism is the acceptance of allegations without evidence or proof, either apart from or against the evidence of one’s senses and one’s reason. Mysticism is the claim to some non-sensory, non-rational, non-definable, non-identifiable means of knowledge, such as “instinct,” “intuition,” “revelation,” or any form of “just knowing.”

Reason is the perception of reality, and rests on a single axiom: the Law of Identity.

Mysticism is the claim to the perception of some other reality — other than the one in which we live — whose definition is only that it is not natural, it is supernatural, and is to be perceived by some form of unnatural or supernatural means."

Ayn Rand, Philosophy: Who Needs It, 62