“Mr. Cox’s first point seems, therefore, not well taken; it is based upon an hypothesis mechanically untenable. Of course our argument proceeds upon the supposition that levitation is an observed fact. The theory of psychic force, to be perfect, must account for all “visible motions…in solid substances”, and among these is levitation.
As to his second point, we deny that “the proof is insufficient” that the force which produces the phenomena is sometimes directed by other intelligences than the mind of the “psychic”. On the contrary there is such an abundance of testimony to show that the mind of the medium, in a majority of cases, has nothing to do with the phenomena, that we cannot be content to let Mr. Cox’s bold assertion go unchallenged.”
Equally illogical do we conceive to be his third proposition; for if the medium’s body be not the generator but simply the channel of the force which produces the phenomena – a question upon which Mr. Cox’s researches throw no light whatever – then it does not follow that because the medium’s “soul, spirit, or mind” directs the medium’s organism, therefore this “soul, spirit, or mind”, lifts a chair or raps at the call of the alphabet.
As to the fourth proposition, namely, that “spirits of the dead are the sole agents in the production of all the phenomena”, we need not join issue at the present moment, inasmuch as the nature of the spirits producing mediumistic manifestations is treated at length in other chapters.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 