This challenge fits so well into a world that desire black and white laws of right and wrong and God seems to provide a muddled grey area of blurring that judgement and salvation. God also recalls that this is part of what God has already instructed: You know O mortal what God desires....to do justice, love kindness, and walk humbly with your God.
In a way God provides remembrance of old to the new path God is about to take. This future leader, the Messiah, will be rooted of old (in the house of David) with the provision of new paths.