"... that man is happy (eudaimon) and blessed (olbios) who, knowing all these rules, goes on with his work guiltless before the gods... and avoids transgression" (Hesiod, Works and Days 826-828)
Among the common problems that, down through the ages, have puzzled humanity, from poets and philosophers to ordinary people, one can certainly include that of happiness.
To wish each other happiness in several circumstances of life; to hear of persons who apparently have everything they thought they wanted and yet cannot say to be completely happy; to see persons who have everything we would think able to bring happiness meet, nonetheless, with all sort of problems - such as drug and alcohol - problems that the common sense would confine to the persons struggling with life; all of these are experiences and thoughts that each of us has had at least once.
Ironically, it is possible that we, after having witness this paradox, nevertheless have never asked ourselves what happinnes is; or else, if we have, we have possibly experienced a feeling of uneasiness in trying to give an answer, that is, a not vague answer bordering in commonplaces.
Interestingly enough, uneasiness and difficulty in defining happiness are apparent in the dictionaries of most of modern languages of the Western Civilization: all definitions appear to be partly tautological, certainly unsatisfactory, given that recurrent motifs...