Oh that I had forever remained . . . heat
Here the Creature unconsciously echoes the sentiments of Victor Frankenstein ("if our impulses were confined to hunger, thirst, and desire, we might be nearly free") from earlier the same morning of their conversation (II:2:3). That the Creature speaks of heat where Victor uses "desire" reflects his very first conscious experiences (II:3:3, II:3:6), but desire is also at this point very much on his mind, as the ensuing paragraphs will stress.