“In the East only, and on the boundless tracts of unexplored Africa, will the student of psychology find abundant food for his truth-hungering soul. The reason is obvious. The atmosphere in populous neighborhoods is badly vitiated by the smoke and fumes of manufactories, steam engines, railroads, and steamboats, and especially by the miasmatic exhalations of the living and the dead.
Nature is as dependent as a human being upon conditions before she can work, and her mighty breathing, so to say, can be as easily interfered with, impeded, and arrested, and the correlation of her forces destroyed in a given spot, as though she were a man.
Not only climate, but also occult influences daily felt not only modify the physio-psychological nature of man, but even alter the constitution of so-called inorganic matter in a degree not fairly realized by European science.
Thus the London Medical and Surgical Journal advises surgeons not to carry lancets to Calcutta, because it has been found by personal experience “that English steel could not bear the atmosphere of India”; so a bunch of English or American keys will be completely covered with rust twenty-four hours after having been brought to Egypt; while objects made of native steel in those countries remain unoxidized.
So, too, it has been found that a Siberian Shaman who has given stupendous proofs of his occult powers among his native Tschukschen, is gradually and often completely deprived of such powers when coming into smoky and foggy London.
Is the inner organism of man less sensitive to climatic influences than a bit of steel? If not, then why should we cast doubt upon the testimony of travelers who may have seen the Shaman, day after day, exhibit phenomena of the most astounding character in his native country, and deny the possibility of such powers and such phenomena, only because he cannot do as much in London or Paris?”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 