Someone had this quote on their e-mail signature, and I liked it.

"The books or music in which we thought the beauty was located will betray us if we trust in them; it was not in them, it only came through them, and what came through them was longing. These things--the beauty, the memory of our own past--are good images of what we really desire; but if they are mistaken for the thing itself they turn into dumb idols, breaking the hearts of their worshippers. For they are not the thing itself; they are only the scent of a flower we have not found, the echo of a tune we have not heard, news from a country we have never yet visited..." -C.S. Lewis