What is happiness for human beings, and how is it attained? What is the happiness that humans share by virtue of being human? Is the happiness in question a single, universally agreed-upon happiness, or are there differing views on this matter, and are there various types of happiness? Is there a hierarchy among happinesses? Can happiness be attained through effort and labor, and what are the views of scholars on this matter? How long does it take to attain happiness, and is a human lifespan sufficient for it? What are the arts and other tools that a person must acquire along this path, and what course should they follow?