It is one of the first principles of Biology that organic life always preponderates over animal life. By this principle the Sociologist explains the superior strength of the self-regarding instincts, since these are all connected more or less closely with the instinct of self-preservation. But although there is no evading this fact, Sociology shows that it is compatible with the existence of benevolent affections, affections which Catholicism had asserted to be altogether alien to our nature, and to be entirely dependent on superhuman Grace derived from a sphere beyond the reach of Law. The great problem, then, is to raise social feeling by artificial effort to the position which, in the natural condition, is held by selfish feeling. The solution is to be found in another biological principle, namely, that functions and organs are developed by constant exercise, and atrophied by prolonged inaction. Now the effect of the Social state is, that while our sympathetic instincts are constantly stimulated, the selfish propensities are restricted; since, if free play were given to them, human intercourse would very shortly become impossible. Thus it compensates to some extent the natural weakness of the Sympathies that they are capable of almost indefinite extension, while Self-love meets inevitably with a more or less efficient check. Both these tendencies naturally increase with the progress of Humanity, and their increase is the best measure of the degree of perfection that we have attained. Their growth, though spontaneous, may be materially hastened by organized intervention, both of individuals and of society, the object being to increase all favourable influences and diminish the unfavourable. This is the object of the art of Morals. Like every other art, it is restricted within certain limits. But in this case the limits are less narrow, because the phenomena, being more complex, are also more modifiable.