Read it through once

POLIXENES. Say there be; Yet nature is made better by no mean But nature makes that mean. So, over that art Which you say adds to nature, is an art That nature makes. You see, sweet maid, we marry A gentler scion to the wildest stock, And make conceive a bark of baser kind By bud of nobler race. This is an art Which does mend nature, change it rather, but The art itself is nature.