David reminds Mary that death and suffering are inescapable parts of life. If a person cannot hope to avoid them, only finding happiness in the moment and facing the future with courage can give meaning to life. David models courage in the face of danger; although he doesn’t deny the existence of suffering, he doesn’t let it rule his life either. And while Nat initially struggles to adopt a similar attitude, he decides to throw himself and his notebooks wholeheartedly into a life at sea. He knows that he takes a grave risk in doing so, but also that the potential rewards—experience, the potential for making money off his venture—will pave the path toward his future.