justice

If you are not familiar with the ultimatum game, it's a sort of social psychology experiment. You (the tester) pick two people and give one of them (Alice) the chance to distribute $100. She can then offer as much or as little of it as she wants to the other (Bob). Finally, Bob can choose to either accept the offer or require that they both give back the money.

Virtues are broad prescriptions about how one should behave. Virtues represent a collective history and tendency to make specific choices, however those choices need not continue to be made. For instance "courage" is a virtue, someone who is "courageous" usually doesn't flee from what they fear, but it is a choice available to them at every encounter. This draws a distinction between virtues and traits. Physical strength is a trait, and not an (ethical) virtue, just because it is a trait that is useful in many situations does not give it a moral value.

Ethics is fundamentally about answering the question "how should you live your life". Implicit in that question is the question "what is good?" as well as the rest of the mess that lives on the other side of Hume's guillotine. Mostly we when we think of ethics we think of a preacher exhorting us to give to charity, or a parent teaching a child not to lie, but "go to college so you can succeed in life" is just as much an ethical statement as "don't lie".