Now the question is how one should set to work in this development. One must also take into consideration one's physical condition. The nervous system must be in a proper condition. It is from nervousness that man goes from bad to worse, and even a good person with good intentions may prove to be otherwise; for he may have good intentions but he cannot carry them out because his nerves are weak. What he needs is the habit of silence, of concentration, of meditation. A person who continually goes on talking or doing things and does not meditate for a while, who does not take a rest, cannot control his nervous system and keep it in order. If there is anything that can control the nervous system it is right breathing; and when that right breathing is done, together with a concentration of thought, then the nervous system is greatly fortified. Besides there are many things which cause unhappiness, and these can often be avoided by keeping the nervous system in hand.