Is the concept of justice a man made construct?
If our salvation depends on whether we have faith or not, aside from our deeds, that would mean that a wicked person who wronged us can be saved, and a righteous person that helps us might not be.
This might feel unjust to us, but does that matter? Do we have to just suck it up and accept it? Accept that out weak, uninformed sense of human justice is an illusion and that God's conception of justice, however incomprehensible to us, is superior? If that is the case, is the need for justice in this earthly life just another human need, like the need for food, sex, power, comfort, that in the end, is meaningless in the grand scheme of things?
Should a good Christian seek to abandon his need for justice to understand and accept God better?