Even liberal thinkers have treated habit as essentially, not because of the character of existing customs, conservative. In fact only in a society dominated by modes of belief and admiration fixed by past custom is habit any more conservative than it is progressive. It all depends upon its quality. Habit is an ability, an art, formed through past experience. But whether an ability is limited to repetition of past acts adopted to past conditions or is available for new emergencies depends wholly upon what kind of habit exists. The tendency to think that only "bad" habits are disserviceable and that bad habits are conventionally enumerable, conduces to make all habits more or less bad. For what makes a habit bad is enslavement to old ruts. The common notion that enslavement to good ends converts mechanical routine into good is a negation of the principle of moral goodness. It identifies morality with what _was_ sometime rational, possibly in some prior experience of one's own, but more probably in the experience of some one else who is now blindly set up as a final authority. The genuine heart of reasonableness (and of goodness in conduct) lies in effective mastery of the conditions which _now_ enter into action. To be satisfied with repeating, with traversing the ruts which in other conditions led to good, is the surest way of creating carelessness about present and actual good. Consider what happens to thought when habit is merely power to repeat acts without thought. Where does thought exist and operate when it is excluded from habitual activities? Is not such thought of necessity shut out from effective power, from ability to control objects and command events? Habits deprived of thought and thought which is futile are two sides of the same fact. To laud habit as conservative while praising thought as the main spring of progress is to take the surest course to making thought abstruse and irrelevant and progress a matter of accident and catastrophe. The concrete fact behind the current separation of body and mind, practice and theory, actualities and ideals, is precisely this separation of habit and thought. Thought which does not exist within ordinary habits of action lacks means of execution. In lacking application, it also lacks test, criterion. Hence it is condemned to a separate realm. If we try to act upon it, our actions are clumsy, forced. In fact, contrary habits (as we have already seen) come into operation and betray our purpose. After a few such experiences, it is subconsciously decided that thought is too precious and high to be exposed to the contingencies of action. It is reserved for separate uses; thought feeds only thought not action. Ideals must not run the risk of contamination and perversion by contact with actual conditions. Thought then either resorts to specialized and technical matters influencing action in the library or laboratory alone, or else it becomes sentimentalized.