We have spoken of the moral law; and, indeed, in our opinion, it is impossible to banish it from the domain of public economy. Any other point of view seems to us too narrow. And when we see eminent men go astray in the pursuit of an ideal which fails to take the human soul into account, and which finds nothing but equations where there are feelings and ideas, we cannot help thinking that they are unfaithful to the thought of the founder of the science, Adam Smith. Man is not simply a piece of machinery. He does not blindly submit to external impulse. Rather is he himself, the greatest of impulses. But to govern things, he must first learn to conquer himself. Personal interest is the powerful motive which he obeys. Man does not live alone, in a state of isolation, in the world. _Væ soli!_ He lives in society and profits by the relations which he forms with other beings, intelligent like himself, and for whom he has a natural feeling of sympathy. The good that comes to them yields satisfaction to him, and the evil that befalls them falls on him likewise. He cannot turn back entirely upon his own personality. Besides his own interest, he feels and shares another interest—the interest of all. Personal interest is perfectly legitimate. The love of self cannot be condemned. The Savior himself has enjoined us to love our neighbor as ourselves. To love him more than ourselves is a very high and beautiful virtue. It is the self-abnegation which inspired Christian heroes. But heroism is rare, and cannot be imposed, nor taken, as a rule. Personal interest is a powerful stimulant, and the superior harmony of social relations makes it contribute to the general good. What must be condemned is a fatal deviation of this sentiment which destroys its effect and narrows its actions. What we need to prevent is the degeneration of personal interest into an egotism which parches, instead of fertilizing, and which compromises the future by the exclusive search after present advantage; for egotism is short-sighted. On the other hand, the broader and more generous feeling which inclines us to sympathize with our fellow beings in their sorrows, and to unite our destiny to theirs; that is, the feeling of the general interest, has a limit too. It would be falsified if it absorbed the individual; if it destroyed the most powerful motive-force by drying up the abundant source of activity; if it attacked moral energy by enervating responsibility; if it extended the circle of results obtained to such an extent that scarcely any one should feel the rebound.