The seventh chapter of The Wisdom of the Overself contains some material which generally answers the questions of life after death. It is quite true that spiritualism has served the useful purpose of proving the existence of an afterlife. Nevertheless it is a dangerous matter to experiment with practically. It is far safer to limit investigation to a study of its literature. More specifically: (1) The quest of psychic experiences is definitely a stumbling block on the true path during the earlier stages. They are almost sure to lead the novice astray, may cause him to waste valuable years, and will sometimes harm him in various ways. Most attempts to establish contact with the astral world will either end in failure and deception or psychic injury. (2) Astral projection is neither wrong nor right but it should not be sought for its own sake. It develops naturally of itself to one who is highly advanced on the truly spiritual quest. But if novices prematurely seek it they are likely to harm themselves. In the end it will be found that spiritualism is only a stepping-stone to the higher mystical philosophy. It is of use as a halfway house for many Westerners, but one should not tarry here too long. The higher and lower teachings are like oil and water. They cannot be mixed together and one day you will have to make your choice between them if you wish to progress and not to remain stagnating.
-- Notebooks Category 16: The Sensitives > Chapter 3: Philosophy, Mysticism, and The Occult > # 101