Editing Psychological egoism (section)

===Psychoanalysis===
Whether or not Sigmund Freud was a psychological egoist, his concept of the [[pleasure principle (psychology)|pleasure principle]] borrowed much from psychological egoism and psychological hedonism in particular.<ref>Wallwork, E. (1991). p. 110</ref> The pleasure principle rules the behavior of the [[Id, ego and super-ego#Id|Id]] which is an unconscious force driving humans to release tension from unfulfilled desires. When Freud introduced [[Thanatos#In psychology and medicine|Thanatos]] and its opposing force, [[Eros (concept)#Sigmund Freud|Eros]], the pleasure principle emanating from psychological hedonism became aligned with the Eros, which drives a person to satiate sexual and reproductive desires.<ref>Wallwork, E. (1991). p. 125</ref>  Alternatively, Thanatos seeks the cessation of pain through death and the end of the pursuit of pleasure: thus, hedonism rules Thanatos, but it centers on the complete avoidance of pain rather than psychological hedonist function which pursues pleasure and avoids pain. Therefore, Freud believed in qualitatively different hedonisms where the total avoidance of pain hedonism and the achievement of the greatest net pleasure hedonism are separate and associated with distinct functions and drives of the human psyche.<ref>Wallwork, E. (1991). p. 132-33</ref> Although Eros and Thanatos are ruled by qualitatively different types of hedonism, Eros remains under the rule of Jeremy Bentham's [[Quantity|quantitative]] psychological hedonism because Eros seeks the greatest net pleasure.