In Nabokov’s "Pnin," the thought-provoking quote emphasizes the fragility of human existence. It suggests that our physical bodies act as protective barriers in a hostile world, where isolation from our surroundings is essential for survival. The mind is depicted as a vessel, akin to a space-traveler's helmet, highlighting the need for inner reflection and personal experiences to maintain our lives.

The quote further explores the concepts of life and death, indicating that death represents a shedding of worldly ties, while also serving as a form of connection. It suggests that to exist is to navigate the delicate balance between solitude and communion, emphasizing the profound intricacies of human life. In essence, Nabokov reflects on the nature of existence and the inherent tensions that come with being alive.