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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 Freud (2015). “Group Psychology and The Analysis of The Ego: Illustrated & Psychology Glossary & Index Added Inside”, p.75, eKitap Projesi
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.