I speak of living many years, but not getting old. I mean exactly what I say. There is no reason why a man should be old at sixty, no, not at seventy. I do not imply that a man should be able to do the same amount of physical work at seventy that he can at thirty, but I do mean to say that all his mental forces should be under his control at seventy years of age, although he will naturally have to use them with care. A man who has not injured his brain forces should retain them up to the last moment of his life, but as he has not the repairing powers of the younger man, he should be careful of the strain put upon them. In this latter fact lies the only difference. Having started well in your vocation, trade or profession, with your fine brain-tools edged to their best, you may now proceed to success or gradual failure. For, of course, just having the training and education does not mean that everything else comes along your way. Not a bit of it. In fact, you will find at first that the care of the working instruments you now have will take a good lot of self-control and the formation of certain necessary habits. It all depends upon how you keep your brain-tools what your future will be. Whether you neglect them once in a while so that they have to be sharpened again, whether you leave them to rust and finally become useless, whether you lay them aside in good condition and take them up again in perfect order, all these matters go for success or failure. If it is only occasionally you neglect the brain-tools, you must remember that each new act of resharpening them leaves a less keen edge. Resting your brain, taking time to recuperate tired cells and enjoying some kind of sport or pleasure that is a benefit instead of an injury to your thoughts, is necessary for every man. These brain-tools I have been speaking of are your powers of thinking correctly, creating, doing, and the absolute integrity which must be retained between the impulses of the mind and the hands which respond to these impulses. The engineer, the auto driver, the mechanic, the draughtsman, the airman, the man who works in perilous heights while constructing tall buildings or bridges, must have perfect harmony throughout all his body――brain, muscles, eyes, ears. Let any one of these senses become unconsciously dull through neglect of right living, and the awful moment comes when an engineer sends a train to wreck with its innocent passengers, a tender pulls a lever a tenth of a second too soon and lets down the derrick’s load upon his fellow workers, or a chauffeur misses the turn by a few inches and sends the auto crashing over a precipice.