If you should come to the realization that justice requires of you a course of action that you had not planned on, you will feel a pull in that direction, and if you do not follow through, you are likely to feel guilty. If your theory of justice informs you that another person is treated unjustly, even a stranger, you are likely to feel compassion for that person, and you may also feel a chivalrous impulse to take up that person's cause and seek redress of the injustice. It was because of feelings of injustice that slavery was abolished and women were granted the right to vote.

As the world shrinks, nations impinge upon one another in more and more ways, providing applications for a theory of justice among nations. ....  Read the whole article