"ye shall be as Gods Knowing both good and evil as they know. That ye should be as Gods, since I as Man, Internal Man, is but proportion meet" (9.708-11)
Satan here appeals to Eve's pride, suggesting that she deserves to know good and evil; it's only natural ("proportion meet"). One should note the irony of using a phrase like "proportion meet." The world is already perfect, yet somehow Satan's rhetoric – maybe because of its own neat "proportions" – convinces Eve that things aren't fair, right, or in "proportion."