What does it mean to be human? What is the purpose of human existence? Dante first articulates these questions in the Convivio, but they resurface in the Comedy and in the Monarchia. Dante defines reason as the essential property of humanity, and the related argument that the end of life, and the source of true happiness for human beings, is to fulfil their rational capacity through the pursuit of knowledge and virtue. Intellectual virtues are involved in the pursuit of knowledge, and moral virtues govern the life of action in the world. ‘Humanity’ also considers the moral system of Inferno and the treatment of humanity in Inferno and Purgatorio.