It should be remembered that there are the 2 tablets of the law...corresponding to the 2 major commandments. One concerns righteousness and the other, holiness. A man can physically do only the outward law of himself. But grace is required to fulfill the law inwardly. The law is spiritual. The depth of the law is to love as Jesus loved...without any spot or wrinkle of sin or offense against the truth.
We need Christ to fulfill the law as intended...to it's proper depth...to be holy as God is holy.