“Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. But after that faith is come, we are no longer under a schoolmaster.”
It wasn’t because the Israelites lacked a willingness to do the law that they failed at it.
The Apostle Paul, speaking about the old man in Romans 7:22 says: “For I delight in the law of God after the inward man…”
That’s the case of the man without Christ. The more he desires to do good, the more he realizes that he can’t.
Verse 23 says: “But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.”
There seems to be a default setting within the carnal man that makes doing the right thing impossible.
Even when he sets his sail in a particular direction, he is automatically redirected to do what he is configured to do.
Imagine for example, what options a dog has if it realizes one day that barking is a sin?
It might want to stop, but when it all comes down to it, it’s a dog. It’s wired to bark.
This is the plight of the carnal man: “For we know that the law is spiritual: but I am carnal, SOLD under sin. For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.”
How can rules and regulations help a man that is engineered to do the very things that they forbid? They can’t!
The best laws can do is to restrain people who already have a disposition towards evil.
That’s why a new law was needed, a new mechanism that had the power to work in people and cause change.