“The time is not far distant when the World of Science will be forced to acknowledge that there exists as much interaction between one mind and another, no matter at what distance, as between one body and another in closest contact. When two minds are sympathetically related, and the instruments through which they function are tuned to respond magnetically and electrically to one another, there is nothing which will prevent the transmission of thoughts from one to the other, at will; for since the mind is not of a tangible nature, that distance can divide it from the object of its contemplation, it follows that the only difference that can exist between two minds is a difference of STATE. So if this latter hindrance is overcome, where is the ‘miracle’ of thought transference, at whatever distance.“

– The Key to Theosophy by H. P. Blavatsky