Next comes the sense of justice, which results in an impulse to discover the cause of good and evil, and when this cause is found to be a voluntary agent, a consequent impulse to make returns of good for good, and of evil for evil, and also to proportion retributive rewards or penalties to the amount of good or evil done.

With this, also, is combined the feeling that those retributions should be applied only where there was voluntary power to have done otherwise. When it is seen that there was no such power, the impulse to reward or punish is repressed.

Such is the deep conviction that such retributions are indispensable, that where natural pains and penalties do not avail, others are demanded, both in the family and in the commonwealth.

Lastly, we find the susceptibility of conscience, which, by the very framework of the mind itself, apportions the retributive pangs of remorse for wrong doing, and the pleasure of self-approval for well doing. These, too, are retributions never to be escaped, and the most exquisite, both in elevated happiness and exquisite pain. The mind carries about in itself its own certain and gracious remunerator—its own inexorable prosecutor, judge, and executioner.

This same design of the Creator may be most delightfully traced in what may be called the economy of happiness and pain.

One particular of this is set forth at large in the chapter on the emotions of taste. Here we find the mind formed not only to secure multitudinous enjoyments through the nerves of sensation, but that, by the principle of association, there is a perpetual reproduction of these emotions in connection with the colors, forms, sounds, and motions with which they were originally associated. Thus there are perpetually returning emotions of pleasure so recondite, so refined, so almost infinite in variety and extent, and yet how little noticed or understood!

Another indication of the same kind is the peculiarity pointed out on former pages, where it is shown that securing certain enjoyments which tend to promote the general happiness increases both desire and capacity for enjoyment, while those that terminate in the individual diminish by possession. Thus the enjoyment of power, which must, from its nature, be confined to a few, diminishes by possession. Thus, too, the pleasures of sense pall by indulgence. But the enjoyment resulting from the exercise and reciprocation of love, and that resulting from benevolent actions, and that which is included in a course of perfect obedience to all the rules of rectitude, increases the capacity for enjoyment.

Another illustration of the same principle is exhibited in the chapter on Habit, where it is seen that the power of pleasurable emotions increases by repetition, while painful emotions decrease when the good to be secured by their agency is attained. Thus fear seems to protect from danger till caution and habit render it needless, and then it decreases. And so of other painful emotions.

It is interesting to trace the same design in the constitution of minds in regard to each other. We find that the purest and highest kind of happiness is dependent on the mutual relations of minds. Thus the enjoyment resulting from the discovery of intellectual and moral traits in other minds—that resulting from giving and receiving affection—that gained by sympathy, and by being the cause of happiness to others, and that resulting from conscious rectitude, all are dependent on the existence of other beings.

Now we find that minds are relatively so constituted that what one desires, it is a source of happiness in another to bestow. Thus one can be pleased by the discovery of certain traits in other minds, while, in return, the exhibition of these traits, and the consciousness that they are appreciated, is an equal source of enjoyment. One mind seeks the love of others, while these, in return, are desiring objects of affection, and rejoice to confer the gift that is sought. The desire of knowledge or the gratification of curiosity is another source of pleasure, while satisfying this desire is a cause of enjoyment to those around. How readily do mankind seize upon every opportunity to convey interesting news to other minds!