In Jeffrey Eugenides' "The Marriage Plot," Leonard comes to an important understanding about depression. He recognizes that heightened intelligence can intensify the impact of this mental health struggle. Those who possess sharper intellects are often more susceptible to the pain and turmoil that depression brings.

This realization suggests that a keen mind may lead to deeper self-reflection and awareness of one's emotional state, which can exacerbate feelings of despair. Leonard's insight highlights the complex relationship between intelligence and mental health, underscoring how the very qualities that can promote understanding and insight may also contribute to one's suffering.