Why does he see the guide's photograph emanating light and charging him with spiritual power? A photo, after all, is a light-phenomenon charged with the electromagnetic ray connection of the person photographed. When the guide tries to help him, his auric mental energy immediately expresses itself through the picture and affects the seeker's mind as its percipient. However, at a certain stage of development, when that energy of the Overself which the Indians call Kundalini is being awakened so as to enable him to do what is then put into his hands to do, the photo carries something more than mere thought; its mental radiations are actually transmuted into light-radiations and so it may at times appear to be suffused with light. And needless to say the most sensitive points in such a picture are the eyes; the help given will therefore affect these points most.
-- Notebooks Category 16: The Sensitives > Chapter 14: The Sensitive Mind > # 21