XLIII. Man also, considered only in his physical nature, is subject to the universal law of self-love; and until he has arrived at a correct appreciation of his moral nature and duties, he will allow himself to be impelled by that law to possess himself of all that he thinks suitable to his own advantage, regardless of the detriment of others, and even of their very existence; and so will, on the other hand, every one else, being in the same condition, act towards him. But the effects of unrestrained self-love are by far more mischievous in man than in the irrational animals, for the intelligence with which he is endowed affords him more means and artifices to accomplish his selfish views, so long as he is governed by these and not by nobler impulses. Hence it happens also, that so long as a man lies under the fascination of self-love, society, of which he is called to become a member, places him in a condition, from which he looks upon his fellow-men as the natural enemies of his individual happiness; and he feels a propensity to throw obstacles, either by malice or violence, in the way of others, to prevent their attaining that which is denied to him. XLIV. But we find, also, in man another principle diametrically opposed to self-love, which, proceeding from the noblest prerogatives of his soul, distinguishes him from the irrational creatures, and invites him to a career totally opposite to theirs. This principle, commonly called virtue, we shall express by the more comprehensive name of _heroism_. As by self-love man is inclined to sacrifice the welfare of others to his own, so by heroism he is led to sacrifice himself to the welfare of others. When we see a mother struggling to death, and with admirable self-devotion, against overpowering waves, or ferocious beasts, or devouring flames, to save her child from certain destruction, it would be stolidity and folly for us to bring into comparison with this act, the cares bestowed by a brute in feeding her young, since as soon as the latter has carried into effect the order of nature, she forsakes them, and, when grown, does not even recognise them; whereas the love of a mother endures beyond the grave. When a husband, bound with the indissoluble tie of affection to the woman of his heart, voluntarily sacrifices to her everything dearest in the world, and finds in her affection ample recompense for his direst privations, who would dare to attribute this to the physical sexual tendency common even to the brutes? a tendency, which, besides manifesting itself only at detached periods of time, disappears altogether in old age, whereas conjugal love runs beyond the confines of time. The same may be said of a friend, who would give his own life to save that of his beloved, of a generous warrior who risks everything for his country's sake, and of a host of others, who magnanimously devote themselves to the relief of suffering humanity; in short, of every one who feels himself moved by a superior