Twice in the paragraph stressing the word "cause," the Creature learns that pleasure
and pain proceed from the same force, a considerable development in his education
and mental sophistication. If this is the groundwork of morality, however, it is important
to recognize that it shares a common bond, as the earlier quotation from Percy Bysshe
Shelley's "Mutability" may remind us, with the scientific systems that form so conspicuous
a context for the novel (see II:2:3 and note). There are other elements emphasized
in the novel that likewise exist on a neutral ground that can result in either good
or ill: curiosity is an obvious case in point (II:2:16).