One may say, indeed, that the evils of too complete repression of individual impulses are more than that they produce nervous strain, dissatisfaction, and, not infrequently, crime. Happiness, as Aristotle long ago pointed out, is a complete living-out of all a man's possibilities. It is most in evidence when people are, as we say, doing what they like to do. And people like to do that which they are prompted to do by the nature which is their inheritance. Freshness, originality, and spontaneity are perhaps particularly valued in our own civilization because of the multiple restraints of business and professional occupations. Even under the most perfect social arrangements there will always exist among men conflicts of desire. Their control over their environment will, of necessity, be imperfect, as will their mastery of their own passions and their clear adjustment to one another. That complete agreement between man's desires and the environment in which alone they can find their satisfaction remains at best an ideal. But it is an ideal which indicates clearly the function of control. This is obviously not to crush native desires, but to organize their harmonious fulfillment. Where men have an opportunity to utilize their native gifts they will be satisfied and interested; where native capacities and desires are continually balked, men will be discontented though well-regimented machines. HABITUAL BEHAVIOR. Except for purposes of analysis, life on the purely instinctive level may be said scarcely to exist in contemporary society, or for that matter, since the beginnings of recorded history. As has been already pointed out, while men are born with an even wider variety of tendencies to act than animals, these are much more plastic and modifiable, more susceptible of training, and much more in need of it than those of the sub-human forms. Even among animals under conditions of domestication, instinct tends largely to be replaced by habitual or acquired modes of behavior. The human being, born with a nervous system and a brain in extremely unformed and plastic condition, is so susceptible to every influence current in his environment that most of his actions within a few years after birth are, when they are not the result of deliberate reflection, secondary or habitual rather than genuinely instinctive. That is, few of the simplest actions of human beings are not in some degree modified by experience. They may appear just as automatic and immediate as if they were instinctive, and indeed they are, but they are learned ways rather than the unlearned ways man has as his possession at birth.