This is why you must learn to choose your thoughts & feelings, with a view to nourishing only the purest, most selfless states of consciousness

"Just as we have a physical stomach, so we also have a psychic stomach. And just as there are skins, peelings, fish bones and so on to be removed from our food before we put it in our mouth, so in the realm of thought and emotion are there certain unclean and harmful elements to be removed.

Those who refuse to study this question of nutrition in the psychic domain have great trials in store for them. Thoughts and feelings are the materials with which man forms his various subtle bodies, and if he builds a hovel, he will not be visited by a prince or high priest, but by beggars, symbolically speaking. It is man who constructs his etheric, astral and mental bodies, and according to the quality of these bodies, his entire destiny is charted. This is why you must learn to choose your thoughts and feelings, with a view to nourishing only the purest, most selfless states of consciousness in yourself. "