Beyond Cartesian Duality
Nietzsche noted a kind of Cartesian split and false duality between art, Greek Tragedy and spirituality on one hand, and politics and the notion of realism that was emerging at the time, on the other hand.
His point, in my estimation, was that to reduce the former to the latter, or the latter to the former, does neither justice, and neither does it help to treat them as completely separate realms which cannot meet. After all, Nietzsche did in fact recognise the importance of unison of opposites.
Also, what is the origin of Greek Tragedy?
This was a reading from Friedrich Nietzsche's The Birth of Tragedy. This version of the text was translated by Shaun Whiteside, edited by Michael Tanner and published by the Penguin Group, London (among other places), in 1993.