All occult development should be shunned until the character has been thoroughly changed, the emotions purified, the will hardened, and superstitions removed by knowledge. It may then come by itself as a resultant by-product of advanced mystical practices in meditation. In this way it will come safely and prove useful. In any other way, moral and mental deterioration may ensue, personal dangers may be incurred, while general futility may be the end of all.
-- Notebooks Category 16: The Sensitives > Chapter 12: The Intermediate Zone > # 14