is with the fact that we ordinarily possess sufficient vitality to carry us successfully through the day, and that if this be inadequate it is because there is waste of energy in our habits of work, in the way we eat, sleep, take recreation and exercise. Shall we first increase the supply of energy by lying fallow, waiting for power to come wherewith to control what is already in exercise? This may be necessary if we are nervously exhausted, but under other conditions it would be like waiting to become unselfish before we begin to do good in the world. The use of energy is learned through action, for actual use ought to show wherein we may wisely accelerate our speed, increase emphasis, or slacken our pace and lessen the intensity. We may infer from the fact that we have enjoyed a restful sleep that there was appropriate responsiveness to nature, whereas to awaken fatigued is to learn that nervous tension has gone before. Again, we learn by catching ourselves in the act of rushing, by slackening speed then and there, moderately and advantageously using the energy which otherwise would have run riot. A new joy comes into life with the growth of equanimity, and with this joy an impetus towards still more fruitful action. Success really comes through concentration on a single mode of activity at a time, since a merely general advance counts for little. To master one habit, preferably the one involved in the most