In the context of Luke's gospel, Jesus is assuring his people that God hears them and sees them. God’s plan involves a radical restructuring of world systems so that injustice is ultimately overturned – and we should be relentlessly crying out for that. We should not be complicit with injustice and when we petition heaven for justice it is a bold proclamation of hope for the world. It is a declaration that we also see the problems around us, and that we will not rest until His kingdom comes here on earth.