When the series started, Walt was the family man, and all he had on his mind was making sure he didn't leave his family with nothing. As he got deeper and deeper into criminal enterprises, his motivations were mostly just necessity - he had to cook for Gus, at first because of a professional obligation, and later because Gus had a theoretical gun to his family's heads. Now those necessities are gone Walt could, in theory, just quit. (Breaking Bad, TV) 9.3/10