I learned . . . thoughts
The Creature turns from Goethe's novel of isolated sensibility, where he sees his own reflection (and we to some extent see Victor's) to contemplate the public and civic models of Plutarch's biographical accounts, engaging a world of social interaction and nation-building of which he has no experience whatsoever. Thus the accounts draw him forth from his own isolation to imagine a larger cultural sphere of action in which he might participate.