“Enq: Theosophy, then, is not, as held by some, a newly devised scheme?
Theo: Only ignorant people can thus refer to it. It is as old as the world, in its teachings and ethics, if not in name, as it is also the broadest and most catholic system among all.
Enq: How comes it, then, that Theosophy has remained so unknown to the nations of the Western Hemisphere? Why should it have been a sealed book to races confessedly the most cultured and advanced?
Theo: We believe there were nations as cultured in days of old and certainly more spiritually “advanced” than we are. But there are several reasons for this willing ignorance. One of them was given by St. Paul to the cultured Athenians – a loss, for long centuries, of real spiritual insight, and even interest, owing to their too great devotion to things of sense and their long slavery to the dead letter of dogma and ritualism.
But the strongest reason for it lies in the fact that real Theosophy has ever been kept a secret.
Enq: You have brought forward proofs that such secrecy has existed; but what was the real cause for it?
Theo: The causes for it were: Firstly the perversity of average human nature and its selfishness, always tending to the gratification of personal desires to the detriment of neighbors and next of kin. Such people can never be entrusted with divine secrets.
Secondly, their unreliability to keep the sacred and divine knowledge from desecration. It is the latter that led to the perversion of the most sublime truths and symbols, and to the gradual transformation of things spiritual into anthropomorphic, concrete, and gross imagery – in other words, to the dwarfing of the god-idea and to idolatry.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 