Victor becomes so caught up in natural philosophy that he ignores everything else, including his family. He progresses rapidly, and suddenly after two years of work he discovers the secret to creating life.
Victor's intense focus allows him to fulfill his ambition and conquer nature, but also cuts him off from society.
Victor decides to build a race of beings, starting with one creature. He spends months alone in his apartment building a body to reanimate, spurred on by the lure of fame and glory, imagining a "new species" that will bless him as its creator.
Cut off from society, Victor seeks glory rather than what's best for society. He foolishly believes he can replace Nature (and God) as the creator of a species.