I need a heart so pure that if it's stripped bare by dementia, it will survive.

The speaker imagines dementia as a force that can strip away memory, identity, and the social self, leaving only whatever is most fundamental. The wish for a “heart so pure” frames moral character—compassion, integrity, love—as the last durable core when cognition fails. It also implies a kind of ethical preparation: if the mind’s narratives and achievements are vulnerable, then cultivating a humane disposition becomes a form of resilience. The line carries both fear and resolve, treating dementia not only as medical decline but as an existential test of what remains when the self is reduced to essentials.