The mutual modification of habits by one another enables us to define the nature of the moral situation. It is not necessary nor advisable to be always considering the interaction of habits with one another, that is to say the effect of a particular habit upon character--which is a name for the total interaction. Such consideration distracts attention from the problem of building up an effective habit. A man who is learning French, or chess-playing or engineering has his hands full with his particular occupation. He would be confused and hampered by constant inquiry into its effect upon character. He would resemble the centipede who by trying to think of the movement of each leg in relation to all the others was rendered unable to travel. At any given time, certain habits must be taken for granted as a matter of course. Their operation is not a matter of moral judgment. They are treated as technical, recreational, professional, hygienic or economic or esthetic rather than moral. To lug in morals, or ulterior effect on character at every point, is to cultivate moral valetudinarianism or priggish posing. Nevertheless any act, even that one which passes ordinarily as trivial, may entail such consequences for habit and character as upon occasion to require judgment from the standpoint of the whole body of conduct. It then comes under moral scrutiny. To know when to leave acts without distinctive moral judgment and when to subject them to it is itself a large factor in morality. The serious matter is that this relative pragmatic, or intellectual, distinction between the moral and non-moral, has been solidified into a fixed and absolute distinction, so that some acts are popularly regarded as forever within and others forever without the moral domain. From this fatal error recognition of the relations of one habit to others preserves us. For it makes us see that character is the name given to the working interaction of habits, and that the cumulative effect of insensible modifications worked by a particular habit in the body of preferences may at any moment require attention.