Only the man who can maintain a correct posture has the stuff out of which to form that idea of standing erect which can be the starting point of a right act. Only the man whose habits are already good can know what the good is. Immediate, seemingly instinctive, feeling of the direction and end of various lines of behavior is in reality the feeling of habits working below direct consciousness. The psychology of illusions of perception is full of illustrations of the distortion introduced by habit into observation of objects. The same fact accounts for the intuitive element in judgments of action, an element which is valuable or the reverse in accord with the quality of dominant habits. For, as Aristotle remarked, the untutored moral perceptions of a good man are usually trustworthy, those of a bad character, not. (But he should have added that the influence of social custom as well as personal habit has to be taken into account in estimating who is the good man and the good judge.) What is true of the dependence of execution of an idea upon habit is true, then, of the formation and quality of the idea. Suppose that by a happy chance a right concrete idea or purpose--concrete, not simply correct in words--has been hit upon: What happens when one with an incorrect habit tries to act in accord with it? Clearly the idea can be carried into execution only with a mechanism already there. If this is defective or perverted, the best intention in the world will yield bad results. In the case of no other engine does one suppose that a defective machine will turn out good goods simply because it is invited to. Everywhere else we recognize that the design and structure of the agency employed tell directly upon the work done. Given a bad habit and the "will" or mental direction to get a good result, and the actual happening is a reverse or looking-glass manifestation of the usual fault--a compensatory twist in the opposite direction. Refusal to recognize this fact only leads to a separation of mind from body, and to supposing that mental or "psychical" mechanisms are different in kind from those of bodily operations and independent of them. So deep seated is this notion that even so "scientific" a theory as modern psycho-analysis thinks that mental habits can be straightened out by some kind of purely psychical manipulation without reference to the distortions of sensation and perception which are due to bad bodily sets. The other side of the error is found in the notion of "scientific" nerve physiologists that it is only necessary to locate a particular diseased cell or local lesion, independent of the whole complex of organic habits, in order to rectify conduct.