What is called happiness in its narrowest sense comes from the satisfaction - most often instantaneous - of pent up needs which have reached great intensity, and by its very nature can only be a transitory experience.
Sigmund Freud - Happiness

Love in itself, in the form of longing and deprivation, lowers the self-regard; whereas to be loved, to have love returned, and to possess the beloved object, exalts it again.
Sigmund Freud - Love

Anything that encourages the growth of emotional ties between men must operate against war.
Sigmund Freud - Emotion - War - People - Encouragement

The great majority work only when forced by necessity, and this natural human aversion to work gives rise to the most difficult social problems.
Sigmund Freud - Working - Problems

See also Sigmund Freud Biography