As a historical fact, the existence of this Esotericism is demonstrable; but it may also be shown that intellectually it is a necessity.
"Esoteric Christianity, or The Lesser Mysteries"
Annie Besant
" Recognises a Secret Tradition; 104 New Testament Proofs of Esotericism; 42 et seq.
"Esoteric Christianity, or The Lesser Mysteries"
Annie Besant
But Esotericism again presents a dual aspect.
"Secret Societies And Subversive Movements"
Nesta H. Webster