Isaiah put great emphasis on justice and mercy to immediate neighbors for they were either members of a covenanted people or resident aliens in a covenanted nation. That gave them a dignity which deserved respect especially through justice and mercy. Moreover other nations would judge the God of Israel by how the Israelites behaved toward one another (Is 58).
Jesus called on his disciples to show justice and mercy toward all persons (Mt 25). Every human being has the dignity of being made in the image of God. Jesus’ disciples would be judged by how much they loved one another and practiced justice and mercy toward the poor.
Every one of us has some community in which we can extend mutual respect and concern even when there are few obvious physical needs. All of us have a right to respect because we are persons and disciples of the Lord. That is justice and mercy in a Christian community.
You always treat me with respect, Lord, though I have often acted in a way unworthy of my own dignity. Teach me the art of respecting my brothers and sisters.