One of Freuds central achievements was to demonstrate how unacceptable thoughts & feelings are repressed into the unconscious from where they continue to exert a decisive influence over our lives. This volume contains a key statement about evidence for the unconscious & how it works as well as major essays on all the fundamentals of mental functioning. Freud explores how we are torn between the pleasure principle & the reality principle how we often find ways both to express & to deny what we most fear & why certain men need fetishes for their sexual satisfaction. His study of our most basic drives & how they are transformed brilliantly illuminates the nature of sadism masochism exhibitionism & voyeurism.