"Here is something of a marvel: we now have far more poets than judges and connoisseurs of poetry. It is far easier to write poetry than to appreciate it. At a rather low level you can judge it by the rules of art: but good, enrapturing, divine poetry is above reason and rules. Whoever can distinguish its beauties with a firm and settled gaze does not in fact see it all, any more than we can see the brilliance of a flash of lightning. It does not exercise our judgment, it ravishes and enraptures it; the frenzy which sets its goads in him who knows how to discern it also strikes a third person who hears him relate and recite it, just as a magnet not only attracts a needle but also pours into it the faculty of attracting others. It can more easily be seen in the theatre that the sacred inspiration of the Muses, having first seized the poet with anger, grief or hatred and driven him outside himself whither they will, then affects the actor through the poet and then, in succession, the entire audience - needle hanging from needle, each attracting the next one in the chain."
from Essays 1:37 'On Cato the Younger'