Neurosis is the result of a conflict between the ego and its id, whereas psychosis is the analogous outcome of a similar disturbance in the relation between the ego and the external world.
Sigmund FreudIn 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 FreudWhoever loves becomes humble. Those who love have, so to speak, pawned a part of their narcissism.
Sigmund Freud