Give a child the habit of sacredly regarding the truth - of carefully respecting the property of others - of scrupulously abstaining from all acts of improvidence which can involve him in distress, and he will just as likely think of rushing into the element in which he cannot breathe, as of lying or cheating or stealing.
I strongly recommend you to follow the analogy of the body in seeking the refreshment of the mind. Everybody knows that both man and horse are very much relieved and rested if, instead of lying down and falling asleep, or endeavouring to fall asleep, he changes the muscles he puts in operation; if instead of level ground he goes up and down hill, it is a rest both to the man walking and the horse which he rides: a different set of muscles is called into action. So I say, call into action a different class of faculties, apply your minds to other objects of wholesome food to yourselves as well as of good to others, and, depend upon it, that is the true mode of getting repose in old age. Do not overwork yourselves: do everything in moderation.
Make sobriety a habit, and intemperance will be hateful; make prudence a habit, and reckless profligacy will be as contrary to the nature of the child, grown or adult, as the most atrocious crimes are to any of us.