Art must unquestionably have a social value; that is, as a potential means of communication it must be addressed, and in comprehensible terms, to the understanding of mankind.
When it is working, you completely go into another place, you're tapping into things that are totally universal, completely beyond your ego and your own self. That's what it's all about.
St. Paul would say to the philosophers that God created man so that he would seek the Divine, try to attain the Divine. That is why all pre-Christian philosophy is theological at its summit.