స్వామి శివానంద సూక్తి

It should be as easy to expel an obnoxious thought from your mind as it is to shake a stone out of your shoe; and, till a man can do that, it is just nonsense to talk about his ascendancy and conquest over nature. He is a mere slave and prey to the bat-winged phantoms that flit through the corridor of his brain.

- Swami Sivananda