" The career of libido, as Freud mapped it out, did more than explain the origins of neuroses, of perversions, and of normal erotic gratification. It also explained ways of feeling and modes of acting that had hitherto seemed quite remote from sexuality: the child's rage at its newborn sibling, the adolescent's volatile friendships, the spinster's unappeasable fear of sexual assault, the pacifist's bellicose love of peace, the fanatic's foaming proselytizing, the fat man's uncontrollable overeating. Beyond that, it could illuminate inquiries and activities, like folklore and history, art and politics, presumably innocent of erotic urges. Psychoanalysis first made it possible to think systematically about so comprehensive, complex and elusive a world of experience as bourgeois love, about the paths, and obstructions, to the confluence of its two currents. "

― Peter Gay , The Bourgeois Experience: Victoria to Freud Volume 2: The Tender Passion