In Sylvia Plath's "The Bell Jar," the protagonist grapples with feelings of disillusionment and existential despair. The quote reflects a profound frustration with humanity's place in the world, suggesting that despite millions of years of evolution, we still remain fundamentally driven by basic instincts and animalistic behaviors. This sentiment indicates a conflict between the ideals of progress and the harsher truths of human nature.
Moreover, Eric's bitter remark encapsulates a larger theme in the novel: the struggle for identity and the search for meaning in a seemingly indifferent universe. It highlights the character's internal conflict and points to the disconnect between societal expectations and personal realities, ultimately questioning the advancements of civilization in the face of enduring primal instincts.