The air they breathe, being a living element with both physical and psychical properties, carries a subtle vital energy. This in India is named by the Sanskrit word prana; in Tibet it is called sugs, in Aikido, Japan, ki, and in China, chi. By controlling its circulation throughout the body, man is able to attain spiritual enlightenment or illumination.

Mountain Dialogues (ed. Swallow Press, 1999) - ISBN: 9780804010184