It is a fact, then, that in the heart of every man there lies a wild beast which only waits for an opportunity to storm and rage, in its desire to inflict pain on others, or, if they stand in his way, to kill them. It is this which is the source of all the lust of war and battle. In trying to tame and to some extent hold it in check, the intelligence, its appointed keeper, has always enough to do. People may, if they please, call it the radical evil of human nature--a name which will at least serve those with whom a word stands for an explanation. I say, however, that it is the will to live, which, more and more embittered by the constant sufferings of existence, seeks to alleviate its own torment by causing torment in others. But in this way a man gradually develops in himself real cruelty and malice. The observation may also be added that as, according to Kant, matter subsists only through the antagonism of the powers of expansion and contraction, so human society subsists only by the antagonism of hatred, or anger, and fear. For there is a moment in the life of all of us when the malignity of our nature might perhaps make us murderers, if it were not accompanied by a due admixture of fear to keep it within bounds; and this fear, again, would make a man the sport and laughing stock of every boy, if anger were not lying ready in him, and keeping watch. But it is _Schadenfreude_, a mischievous delight in the misfortunes of others, which remains the worst trait in human nature. It is a feeling which is closely akin to cruelty, and differs from it, to say the truth, only as theory from practice. In general, it may be said of it that it takes the place which pity ought to take--pity which is its opposite, and the true source of all real justice and charity. _Envy_ is also opposed to pity, but in another sense; envy, that is to say, is produced by a cause directly antagonistic to that which produces the delight in mischief. The opposition between pity and envy on the one hand, and pity and the delight in mischief on the other, rests, in the main, on the occasions which call them forth. In the case of envy it is only as a direct effect of the cause which excites it that we feel it at all. That is just the reason why envy, although it is a reprehensible feeling, still admits of some excuse, and is, in general, a very human quality; whereas the delight in mischief is diabolical, and its taunts are the laughter of hell.