Under this head is traced the genesis of sympathy through representation of the pains and pleasures of others and interpretation of them by individual experience in the same environment; and the genesis of benevolence, the active side of sympathy, through habit associated with the ideas of the pleasures and pains of others. Love is defined as "originally the association of many pleasures with one individual." From the wider experience of man as a member of a state is developed justice or the sense of equality of right, patriotism, etc. All these feelings are hereditary. OF THE RELATION OF MAN TO NATURE This portion of the book treats of the gradual development of knowledge to wider and wider generalization; of the extension of sympathy from man to the animal world also; of the universality of consciousness, which exists in the inanimate as well as the animate world; of the perfection of morality through the perfection of knowledge, since "knowledge moulds emotion, and absolute virtue is nothing but absolute correspondence with nature in action resulting from thought"; and of the evolution of religion, through knowledge, to a religion of knowledge of the real universe or of humanity. OF THE WILL Under this heading the metaphysical doctrine of freedom of the will is combated as a contradiction of the laws of Cause and Effect. Praise and blame, reward and punishment, are desirable because of their effect on action. OF OBLIGATION Barratt defines obligation as a "violent motive." Paley says: "If a man finds the pleasure of sin to exceed the remorse of conscience, of which he alone is the judge, the moral-instinct man, so far as I can understand, has nothing more to offer." What, then, asks Barratt, has he himself to offer if a man finds the pleasure of sin to exceed the pain entailed by disobedience to the external command? It may, indeed, be the fact that particular kinds of motive only come from particular sources, but unless we can prove that those coming from a command are always the strongest, we cannot claim for them a position such as that implied by the word obligation, of being the highest or most universal motives. In a contest between two motives, it is not the kind but the quantity which decides. For if two pleasures or pains be equal, what does it matter where they came from? And if they be not equal, the greater, whatever its source, will always be the stronger motive. "Hence obligation is nothing more than a 'violent motive.' Prudence and duty are both the following of the greatest pleasure; but so far as in ordinary language we make a distinction between them, the pleasure aimed at in prudence is proximate and only slightly greater than the pain, whereas in duty it is not only very considerably greater, but the greatness is further glorified by a dim aureole of magnificent generalities and the halo of an unfathomable future....