The way to remove my ear plugs is to do works of justice to your neighbor. Then I will notice your sackcloth and your fasting. Matthew, in chapter 25, quotes Jesus giving a similar message about the paramount importance of justice for our salvation. Justice affirms the equal dignity of every human being. We are all God's creation, and Jesus died for each of us.
Justice promotes personal and social responsibility.
All order is based on the notion that I give you what is due to you, and vice versa. Justice and human dignity go hand in hand. In Isaiah's day, works of injustice included oppressing workers, striking the poor, demeaning minorities, and not aiding the hungry and homeless. Today the same would be true. However, in a university setting other aspects of justice are more relevant.