We are forced to pay attention to these answers because the implications of these claims are far reaching. It suggests grand things about human potential, about who we are, why we are, and how we must relate to one another. It gives us a framework for moral life as well as provide the key to human liberation and even immortality. Get to it Russell. It's easy, really.
All good things come in threes.
These are the hewers of wood, and drawers of water. Justice does not emerge spontaneously. Certain characteristics re assigned to each of these three classes. Justice demands certain cultivation of each nature. Of course a raw propensity for wisdom or courage does not guarantee the emergence of wisdom and courage.