In reply, the author remarks that, supposing happiness impossible, the prevention of unhappiness might still be an object, which is a mode of Utility. But the alleged impossibility of happiness is either a verbal quibble or an exaggeration. No one contends for a life of sustained rapture; occasional moments of such, in an existence of few and transitory pains, many and various pleasures, with a predominance of the active over the passive, and moderate expectations on the whole, constitute a life worthy to be called happiness. Numbers of mankind have been satisfied with much less. There are two great factors of enjoyment--tranquillity and excitement. With the one, little pleasure will suffice; with the other, considerable pain can be endured. It does not appear impossible to secure both in alternation. The principal defect in persons of fortunate lot is to care for nobody but themselves; this curtails the excitements of life, and makes everything dwindle as the end approaches. Another circumstance rendering life unsatisfactory is the want of mental cultivation, by which men are deprived of the inexhaustible pleasures of knowledge, not merely in the shape of science, but as practice and fine art. It is not at all difficult to indicate sources of happiness; the main stress of the problem lies in the contest with the positive evils of life, the great sources of physical and of mental suffering--indigence, disease, and the unkindness, worthlessness, or premature loss of objects of affection. Poverty and Disease may be contracted in dimensions; and even vicissitudes of fortune are not wholly beyond control. It is unquestionably possible to do without happiness. This is the lot of the greater part of mankind, and is often voluntarily chosen by the hero or the martyr. But self-sacrifice is not its own end; it must be made to earn for others immunity from sacrifice. It must be a very imperfect state of the world's arrangements that requires any one to serve the happiness of others by the absolute sacrifice of their own; yet undoubtedly while the world is in that imperfect state, the readiness to make such a sacrifice is the highest virtue that can be found in man. Nay, farther, the conscious ability to do without happiness, in such a condition of the world, is the best prospect of realizing such happiness as is attainable. Meanwhile, self-devotion belongs as much to the Utilitarian as to the Stoic or the Transcendentalist; with the reservation that a sacrifice not tending to increase the sum of happiness is to be held as wasted. The golden rule, do as you would be done by, is the ideal perfection of utilitarian morality. The means of approaching this ideal are, first, that laws and society should endeavour to place the interest of the individual in harmony with the interest of the whole; and, secondly, that education and opinion should establish in the mind of each individual an indissoluble association between his own good and the good of the whole.