Both quotes were used to describe Dr. Manette. At first, he is described as absolutely miserable, having no reason to live. However, later in the chapter, Dr. Manette is introduced to his daughter. The sight of her rejuvenated him, giving him something to live for. She freed his spirit, giving him perhaps something to stay alive to see, and someone to enjoy the presence of. This feeds into the idea of duality, in which misery clearly exists, however there is still hope, something to look forward to, in this case, his daughter, which serves to provide a spring of hope that frees him from his distraught state.