Plato's well-known answer rests upon the fundamental responsibility to seek wisdom, wisdom which leads to an understanding of the Form of the Good. Plato further argues that such understanding of forms produces and ensures the good communal life when ideally structured under a philosopher king in a society with three classes (philosophers kings, guardians and workers) that neatly mirror his triadic view of the individual soul (reason, spirit and appetite). In this manner, justice is obtained when knowledge of how to fulfill one's moral and political function in society is put into practice.