To all this corresponds the important _rôle_ which the relation of the sexes plays in the world of men, where it is really the invisible central point of all action and conduct, and peeps out everywhere in spite of all veils thrown over it. It is the cause of war and the end of peace, the basis of what is serious, and the aim of the jest, the inexhaustible source of wit, the key to all allusions, and the meaning of all mysterious hints, of all unspoken offers and all stolen glances, the daily meditation of the young, and often also of the old, the hourly thought of the unchaste, and even against their will the constantly recurring imagination of the chaste, the ever ready material of a joke, just because the profoundest seriousness lies at its foundation. It is, however, the piquant element and the joke of life that the chief concern of all men is secretly pursued and ostensibly ignored as much as possible. But, in fact, we see it every moment seat itself, as the true and hereditary lord of the world, out of the fulness of its own strength, upon the ancestral throne, and looking down from thence with scornful glances, laugh at the preparations which have been made to bind it, imprison it, or at least to limit it and wherever it is possible to keep it concealed, or even so to master it that it shall only appear as a subordinate, secondary concern of life. But all this agrees with the fact that the sexual passion is the kernel of the will to live, and consequently the concentration of all desire; therefore in the text I have called the genital organs the focus of the will. Indeed, one may say man is concrete sexual desire; for his origin is an act of copulation and his wish of wishes is an act of copulation, and this tendency alone perpetuates and holds together his whole phenomenal existence. The will to live manifests itself indeed primarily as an effort to sustain the individual; yet this is only a step to the effort to sustain the species, and the latter endeavour must be more powerful in proportion as the life of the species surpasses that of the individual in duration, extension, and value. Therefore sexual passion is the most perfect manifestation of the will to live, its most distinctly expressed type; and the origin of the individual in it, and its primacy over all other desires of the natural man, are both in complete agreement with this.