Nick Wolterstorff on the purpose of art (via Alan Jacobs):

What then is art for? What purpose underlies this human universal?

One of my fundamental theses is that this question, so often posed, must be rejected rather than answered. The question assumes that there is such a thing as the purpose of art. That assumption is false. There is no purpose which art serves, nor any which it is intended to serve. Art plays and is meant to play an enormous diversity of roles in human life. Works of art are instruments by which we perform such diverse actions as praising our great men and expressing our grief, evoking emotion and communicating knowledge. Works of art are objects of such actions as contemplation for the sake of delight. Works of art are accompaniments for such actions as hoeing cotton and rocking infants. Works of art are background for such actions as eating meals and walking through airports.

Works of art equip us for action. And the range of actions for which they equip us is very nearly as broad as the range of human action itself. The purposes of art are the purposes of life.