Dr. Lewis wisely continues: “It is not often possible to say of those acts that are called vices, that they are really vices except in degree. That is, it is difficult to say of any actions, or courses of action, that are called vices, that they really would have been vices, if they had stopped short of a certain point. The question of vice or virtue, therefore, in all such cases, is a question of quantity and degree, and not of the intrinsic character of any single act, by itself. This fact adds to the difficulty, not to say the impossibility, of any one’s--except each individual for himself--drawing any accurate line, or anything like an accurate line, between virtue and vice; that is, of telling where virtue ends and vice begins. And this is another reason why this whole question of virtue and vice should be left for each person to settle for himself. Vices are usually pleasurable, at least for the time being, and often do not disclose themselves as vices, by their effects, until they have been practiced for many years, or perhaps for a life-time. To many, perhaps most, of those who practice them, they do not disclose themselves as vices, at all during life. Virtues, on the other hand, often appear so harsh and rugged, they require the sacrifice of so much present happiness, at least, and the results which alone prove them to be virtues, are so often distant and obscure, in fact so absolutely invisible to the minds of many, especially of the young, that, from the very nature of things, there can be no universal or even general knowledge that they are virtues. In truth, the studies of profound philosophers have been expended--if not wholly in vain, certainly with very small results--in efforts to draw the lines between virtues and vices.