_My concept of Genius._—Great men, like great ages, are explosive material, in which a stupendous amount of power is accumulated; the first conditions of their existence are always historical and physiological; they are the outcome of the fact that for long ages energy has been collected, hoarded up, saved up and preserved for their use, and that no explosion has taken place. When, the tension in the bulk has become sufficiently excessive, the most fortuitous stimulus suffices in order to call “genius,” “great deeds,” and momentous fate into the world. What then is the good of all environment, historical periods, “_Zeitgeist_” (Spirit of the age) and “public opinion”?—Take the case of Napoleon. France of the Revolution, and still more of the period preceding the Revolution, would have brought forward a type which was the very reverse of Napoleon: it actually _did_ produce such a type. And because Napoleon was something different, the heir of a stronger, more lasting and older civilisation than that which in France was being smashed to atoms he became master there, he was the only master there. Great men are necessary, the age in which they appear is a matter of chance; the fact that they almost invariably master their age is accounted for simply by the fact that they are stronger, that they are older, and that power has been stored longer for them. The relation of a genius to his age is that which exists between strength and weakness and between maturity and youth: the age is relatively always very much younger, thinner, less mature, less resolute and more childish. The fact that the general opinion in France at the present day, is utterly different on this very point (in Germany too, but that is of no consequence); the fact that in that country the theory of environment—a regular neuropathic notion—has become sacrosanct and almost scientific, and finds acceptance even among the physiologists, is a very bad, and exceedingly depressing sign. In England too the same belief prevails: but nobody will be surprised at that. The Englishman knows only two ways of understanding the genius and the “great man”: either _democratically_ in the style of Buckle, or religiously after the manner of Carlyle.—The danger which great men and great ages represent, is simply extraordinary; every kind of exhaustion and of sterility follows in their wake. The great man is an end; the great age—the Renaissance for instance,—is an end. The genius—in work and in deed,—is necessarily a squanderer: the fact that he spends himself constitutes his greatness. The instinct of self-preservation is as it were suspended in him; the overpowering pressure of out-flowing energy in him forbids any such protection and prudence. People call this “self-sacrifice,” they praise his “heroism,” his indifference to his own well-being, his utter devotion to an idea, a great cause, a father-land: All misunderstandings.... He flows out,