Question: How does the spirit take possession of a person? How does the spirit gain access to the person's consciousness? Do they just go in?
Sri Chinmoy: They have the power in the vital world. They can easily do it while you are walking down the street or any time. And why just spirits? Human thought can also enter. If just now you have good thoughts, very powerful thoughts, with those powerful thoughts you can enter into someone else very powerfully. You are sending thought waves to someone, and he may see an actual being before him, as if in a dream. This being can take any form you will it to. From thought we can create form, for thought is very powerful. When the Yogis use their willpower or thought, immediately they give form to it. The story that Kanan acted about stealing the egg-plant — do you think that it is just a cock-and-bull story, that it has no reality in it? That story is absolutely authentic. The woman who kept appearing all the time and the child and all that — these all came from thought waves, from the willpower of the Master. The Yogi used his willpower and immediately it took form.
Sri Chinmoy, Astrology, the supernatural and the Beyond, Agni Press, 1973