Justice -- You get what you deserve both good and bad. Justice means that if you think every deserves to have affordable housing, enough food to eat, etc. then that is part of justice. It also means that if you break the rules, justice is that you get the punishment that is appropriate for the crime. For example, the kids made a rule that if you don;t clean up your mess at lunch, then the next meal you have to take everyone's dishes back. This allows us to teach about the social justice that Jesus advocated for. (Could be applied to other religions as wel)l
Mercy -- You get less bad stuff than you deserve. When we show mercy to others, they do not get the bad things that they deserve for breaking the rules.
Grace -- You get more good stuff than you deserve. God pours out his grace on us and others giving us a lot more good than we deserve.
Justice, mercy, and grace from a faith perspective.
Be wary of people who want mercy and grace for themselves, but justice for others.