Pleasures and pains may be divided into two classes, active and passive; active pleasures being those attendant on an act, as gratification of an impulse, passive pleasures those which come to us as enjoyments, not as the gratification of the impulse producing an act, though perhaps resulting from our act. Active pains are those of want, passive those of suffering. The pleasures accompanying an act as pleasures of attainment are always pleasures of gratification, but not of gratification merely, for they gratify a sentiment directed towards an object previously present to the mind in idea; and it is because the volition realizes the idea that the pleasures are called pleasures of attainment, and in this fact lies also their ethical value. The ethical pleasure in the action itself is not to be confused with the mere pleasure in the explicit consciousness of right-doing, which argues special reflectiveness. The ethical pleasure meant is identical with the feeling of approbation, not as a reflection on the act as idea, but as present in the act itself. But the ethical pleasures are not independent of the incidental pleasures, but depend upon them, the latter themselves being considered in determining what acts are to be performed. The pleasure-formula of the end represents the end in terms of all the ethical pleasures secured by good action; and now we can see how morality can be expressed in terms of all the pleasures and pains involved in action, the purely ethical pleasures being reckoned among the rest. Every pleasure is an inducement to persistence, every pain an inducement to change; hence, since the society of good persons, or the kingdom of powers within a man's own mind acquiesce in the moral order as the equilibrium in which all their claims are gratified as far as may be, it follows that the order of good conduct represents the maximum of happiness. The end thus _involves_ the greatest happiness of the greatest number.