One special exercise of the Short Path is easily done by some persons and gives them excellent results, although it is hard to do by others. It consists in refusing to let remain any particular mental registration of the surrounding place or people, or of any physical experience being undergone. Instead the mental image is to be firmly dismissed with the thought, "This too is like a dream," and then immediately forgotten. The exercise may be kept up for fifteen to twenty minutes at a time. The practical benefit it yields is to give improved self-control; the metaphysical benefit is to weaken the sway of illusion; the mystical benefit is to enable him to take the stand of the Witness-attitude more easily; and the personal benefit is to make him a freer and happier man.
-- Notebooks Category 23: Advanced Contemplation > Chapter 6: Advanced Meditation > # 95