The work of the body is sometimes kept under a man's control, but he does not keep the work of the mind under his control. This is not became he cannot do so; it is became he never thinks about it. Does one ever stop to ask oneself, "Why was I thinking? Was there any purpose in those anxious, worried thoughts? Was it not that the mind was just allowed to go wherever it wanted? While sitting quietly in a chair, were not the thoughts active with things that have nothing to do with my life, with things that do not matter in the least either to myself or to anyone else? It was just a waste of energy.'