 For Marcuse, liberation means a freeing up of the pleasure principle. However, he realizes that if human beings are to co-exist, some degree of repression is necessary. That is, if one acted simply according to the demands of the pleasure principle, this would lead to an infringement on the freedom of others. Hence, there has to be a mutual limiting of freedom and happiness if we are to co-exist. It is with regards to this problem that Marcuse comes up with one of his most creative modifications of Freud’s theory. 