Leeman points out that in the old covenant, obedient covenant members were promised a safe and prosperous life - 'Keep the words of this covenant and do them, that you may prosper in all you do' (Deut. 29:9). Of course, this depended on their success in keeping the covenant, which dependence itself was a threat to their security, because they weren't very good at keeping the covenant, and therefore not very safe. A new covenant, ordered in all things and sure through Jesus Christ gives us so much more! And, it "affords multiple layers of protection":
First, it provides protection from the wrath of God because sin is forgiven.
Since, therefore, we have now been justified by his blood, much more shall we be saved by him from the wrath of God. For if while we were enemies we were reconciled to God by the death of his Son, much more, now that we are reconciled, shall we be saved by his life. - Romans 5:9-10
Second, it protects the soul against those who can harm only the body. All the protections promised in the Psalms essentially become the Christian's, albeit in a reconstituted form.
Because you have made the LORD your dwelling place—the Most High, who is my refuge no evil shall be allowed to befall you,no plague come near your tent. - Psalm 91:9-10
Third, it protects us from ourselves and our inability to fulfill the requirements of the old covenant.
I will make with them an everlasting covenant, that I will not turn away from doing good to them. And I will put the fear of me in their hearts, that they may not turn from me. - Jeremiah 32:40
Fourth, it protects the Christian from the enslavement of sin, since sin no longer has mastery over him or her.
For sin will have no dominion over you, since you are not under law but under grace. - Romans 6:14
Fifth, it welcomes Christians into a domain where authority is exercised to create rather than to steal, to build rather than to tear down, which means that the Christian can know the protection of God's people (Matt. 20:25; 1 Pet. 5:3).
Safe from God's anger and eternal punishment, from the devil and all the enemies with him, from my very self, from sin and from ever being really alone.