To attempt the elimination of all thoughts as they arise, with the aim of keeping consciousness entirely empty of all content, is another method which some yogis and not a few Occidentals try to practise. It is not as easy as it seems and is not frequently successful. Philosophy does not use this rash method, does not recommend making the mind just a blank. There are two perils in it. The first is that it lays a man open to psychic invasion from outside himself, or, failing that, from inside himself. In the first case, he becomes a spiritualistic medium, passively surrenders himself to any unseen entity which may pass through the door thus left open, and risks being taken possession of by this entity. It may be earthbound, foolish, lying, or evil, at worst. In the second case, he unlooses the controls of the conscious self and lets into it forces that he has long outgrown but not fully eliminated--past selves that are dying and would be best left alone, subconscious impulses that lead into evil or insane hallucinations masquerading as occult perceptions or powers. Now it is correct to say that the mind must be completely mastered and that a vacuum will arise in the process, but this is still not the way to do it. The better way is to focus the mind so unwaveringly on some one thing, thought or image or phrase, so elevated that a point will be reached where the higher self itself suddenly obliterates the thoughts.
-- Notebooks Category 4: Elementary Meditation > Chapter 3 : Fundamentals > # 68
