"Psycho-analytic work has shown us that it is precisely these frustrations of sexual life which people known as neurotics cannot tolerate". So Freud begins the fifth section of this work, which explores the reasons why love cannot be the answer, and concludes that there exists a genuine and irreducible aggressive drive within all human beings. And while the love instinct (eros) can be commandeered by society to bind its members together, the aggressive instinct runs counter to this tendency and must either be repressed or be directed against a rival culture. Thus, Freud acknowledges there is irrevocable ill-will within the hearts of man, and that civilization primarily exists to curb and restrain these impulses.