Browsing the Explore website and came across this excellent observation excerpted from an interview with British psychoanalytical writer Adam Phillips. Though Phillips' comments refer to music, they hold true for any successful creative expression:
The emotional impact of music is so incommensurate with what people can say about it, and that seems to be very illustrative of something fundamental—that very powerful emotional effects often can’t be articulated. You know something’s happened to you but you don’t know what it is.