adjective: known about or understood by very few people
adjective: confined to and understandable by only an enlightened inner circle
Manly Palmer Hall
“Esoteric more generally means simply a continuing knowledge of reality which is rejected. That it is esoteric not because it cannot be known but because we refuse to recognize it. Therefore it remains a profound secret.” [Manly Palmer Hall, The Pineal Gland; The Eye Of God]
See Also
Chapter XXII - A Glimpse of the Occult World
Esotericism
Occult Doctrine
Occult Science
Occult
Occultism
occultist