I will go farther. It is by our reflective and reasoning powers, with which we seem to be exclusively endowed, that we know that it is injurious, first to others and then to ourselves, to resist the social instinct which governs us, and which we call JUSTICE. It is our reason which teaches us that the selfish man, the robber, the murderer--in a word, the traitor to society--sins against Nature, and is guilty with respect to others and himself, when he does wrong wilfully. Finally, it is our social sentiment on the one hand, and our reason on the other, which cause us to think that beings such as we should take the responsibility of their acts. Such is the principle of remorse, revenge, and penal justice. But this proves only an intellectual diversity between the animals and man, not at all an affectional one; for, although we reason upon our relations with our fellows, we likewise reason upon our most trivial actions,--such as drinking, eating, choosing a wife, or selecting a dwelling-place. We reason upon things earthly and things heavenly; there is nothing to which our reasoning powers are not applicable. Now, just as the knowledge of external phenomena, which we acquire, has no influence upon their causes and laws, so reflection, by illuminating our instinct, enlightens us as to our sentient nature, but does not alter its character; it tells us what our morality is, but neither changes nor modifies it. Our dissatisfaction with ourselves after doing wrong, the indignation which we feel at the sight of injustice, the idea of deserved punishment and due remuneration, are effects of reflection, and not immediate effects of instinct and emotion. Our appreciation (I do not say exclusive appreciation, for the animals also realize that they have done wrong, and are indignant when one of their number is attacked, but), our infinitely superior appreciation of our social duties, our knowledge of good and evil, does not establish, as regards morality, any vital difference between man and the beasts. % 2.--Of the first and second degrees of Sociability. I insist upon the fact, which I have just pointed out, as one of the most important facts of anthropology.