In the development of mankind as a whole, just as in individuals, love alone acts as the civilizing factor in the sense that it brings a change from egoism to altruism.
Sigmund FreudAn intimate friend and a hated enemy have always been indispensable requirements for my emotional life; I have always been able to create them anew, and not infrequently my childish ideal has been so closely approached that friend and enemy coincided in the same person.
Sigmund FreudCivilized society is perpetually menaced with disintegration through this primary hostility of men towards one another.
Sigmund FreudUnexpressed emotions will never die. They are buried alive and will come forth later in uglier ways.
Sigmund Freud