In this essay he holds that the supreme rule of earthly wisdom is contained in Aristotle's dictum that the sage will seek to dwell where pain is not, and not where pleasure is. The truth of this axiom he establishes by a constant reiteration of his favorite theory that pleasure as well as happiness is negative, and only pain is real. Now other writers, particularly Mr. James Sully and Herr von Hartmann, have rebelled against this statement, but the force of their arguments has not been strong enough to confute it. Indeed, mere logic can make no man contented, and in any event, if a philosopher considers pleasure as a negative condition, and the critic prefers to look upon it in a different light, the student is no more bound to agree with the one than with the other; he will, if properly advised, draw his conclusions from his own sensations. In accordance with the best views, however, Schopenhauer is right and his critics wrong. A homely example which he suggests may perhaps serve to set the matter straight: when we are in perfect health, and there is but one little painful spot somewhere--for instance, an aching tooth or a swollen finger--our otherwise perfect health is unnoticed, and our attention is directed entirely to the pain we are experiencing, while pleasure, determined, as always, by the totality of the sensations, is entirely effaced. In the same manner, when everything in which we are interested is going as we wish, save one thing which is going the wrong way, it is this particular thing that is constantly in our mind, and not the other and more important matters, which are giving us no concern. Schopenhauer's advice, therefore, is that attention should not be directed to the pleasures of life, but to the means by which its innumerable evils may best be escaped. If this recommendation is not sound, then Voltaire's aphorism--happiness is but a dream and only pain is real--is as false in appearance as it is correct in reality. Whoever, then, would draw up a balance sheet of pleasure and pain should not base the sum total on the amount of pleasures which he has enjoyed, but rather in accordance with the pains which he has avoided. For as it has been pointed out, life at best is not given to us to be enjoyed, but to be endured, and the happiest man is, therefore, he who has wandered through life with the smallest burden of physical and mental suffering, and not he to whom the most vivid delights and intensest joys have been accorded.