Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 3
I have omitted all this time to reply to your letter forwarding your friend’s statement about his experiences. I am not very sure of its significance. The “double” voice is a frequent phenomenon; it happens very often when one has been long repeating a mantra that a voice or consciousness within begins to repeat it automatically – also prayer can be taken up in the same way from within. It is usually by an awakening of the inner consciousness or by the going in of the consciousness more deeply within from its outward poise that this happens. This is supported in his case by the fact that he feels himself halfway to trance, his body seems to melt away, he does not feel the weight of the book etc.; all these are well-known signs of the inner consciousness getting awake and largely replacing the outer. The moral effects of his new condition would also indicate an awakening of the inner consciousness, the psychic or psychic-mental perhaps. But on the other hand, he seems to feel this other voice as if outside him and to have the sense of 
another being than himself, an invisible presence in the room. The inner being is often felt as someone separate from or other than the ordinary self, but it is not usually felt outside. So it may be that in this state of withdrawal he comes into contact with another plane or world and attracts to himself one of its beings who wants to share in his sadhana and govern it. This last is not a very safe phenomenon, for it is difficult to say from the data what kind of being it is and the handing over of the government of one’s inner development to any other than the Divine, the Guru or one’s own psychic being may bring with it serious peril. That is all I can say at present.