“We are quite ready to concede to skeptics that one-half, and even more, of seeming phenomena, are but more or less clever fraud. Recent exposures, especially of “materializing” mediums, but too well prove the fact. Unquestionably numerous others are still in store, and this will continue until tests have become so perfect and spiritualists so reasonable as no longer to furnish opportunity to mediums or weapons to adversaries.
What should sensible spiritualists think of the character of angel guides, who after monopolizing, perhaps for years, a poor medium’s time, health and means, suddenly abandon him when he most needs their help? None but creatures without soul or conscience would be guilty of such injustice.
Conditions? Mere sophistry. What sort of spirits must they be who would not summon if necessary an army of spirit-friends (if such there be) to snatch the innocent medium from the pit dug for his feet? Such things happened in the olden time, such may happen now.
There were apparitions before modern spiritualism, and phenomena like ours in every previous age. If modern manifestations are a reality and palpable facts, so must have been the so-called “miracles” and thaumaturgic exploits of old; or if the latter are but fictions of superstition so must be the former, for they rest on no better testimony.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 