Often controversial, always inspired, French intellectual Jacques Lacan begins the twentieth year of his famous Seminar by weighing theories of the relationship between the desire for love and the attainment of knowledge from such influential and diverse thinkers as Aristotle, Marx, and Freud. From here he leads us through mathematics, philosophy, religion, and, naturally, psychoanalysis into an entirely new and unexpected way of interpreting the two most fundamental human drives. Anticipated by English-speaking readers for more than twenty years, this annotated translation presents Lacan's most sophisticated work on love, desire, and jouissance.