Leaves of Morya's Garden - Book 2 - Illumination (1925) - 3.4.13: Invisible slayings are incomparably more numerous than the bloody ones. Out of hatred, out of ignorance, out of fear, men implant poisoned arrows, the force of which is great. One of the best means of defense is the concept of an occult circle. But the best remedy must be taken according to exact indications.