Benjamin Franklin's proverb about diligence resonated with John D. Rockefeller, who believed that hard work and accumulating wealth were intertwined. Rockefeller's commitment to God's glory and his talent for making money drove him to create the largest business and philanthropic enterprise of his time. This chapter explores Rockefeller's unwavering dedication to his craft and the importance of seizing unpredictable opportunities that arise from taking one's work seriously.