text:  In the mean time "life" and "source" distinctly concern the creative power in the soul of the poet; art's "end" must be known and fixedly looked at as the lodestar by the mariner by presiding criticism in the same soul; and the "test" of art must evidently be applied by the critic discharging his peculiar functions; whilst "unerring nature " imaged as the sun enlightens of course both poet and critic