" Since happiness is defined in terms of positive feelings and personal gains, striving for happiness requires competition and therefore may damage people’s social connections and increase both their sense of loneliness and detachment from others. Similarly, many other authors have reported that happiness positively correlates with narcissism, which lies at the core of self-aggrandizement, selfishness, egocentrism, hubristic pride, and self-absorption, all of them aspects underlying a vast array of mental disorders. "

― Eva Illouz