A Reason for The Law
1 John 3:4
Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.
I have pointed out that the word "commandments" would be more precisely translated "precepts". Here we have the reference to "the law" which is normally associated with the Mosaic Law. When we think of the law, we automatically think of the commandments that are in it. What we must consider is the purpose of the law. There may not have been in a law or commandment in my home when I was growing up that stated, "Thou shalt not paint the cat" until I tried to paint the cat! It was presumed it was already in my "make-up" to do that, but since it obviously wasn't, that law was added.
Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.
In God's perfect plan of the Grand Scheme of things, He knows that mankind is capable of doing anything that is contrary to His Righteousness. So the Mosaic Law was added to Inherent Law. An example of Inherent Law is the fact that Cain murdered Abel, it was wrong and Cain knew it was wrong even though there was no written "law" forbidding it.
Sin is literally, "missing the mark", which mankind does on a fairly consistent basis. The purpose of the law was to show mankind how we do not measure up to the righteousness of God. In God's infinite wisdom, He made the provision that would bring us to Him on His terms. His terms require that we be absolutely righteous, which cannot be attained from our position of total depravity. The law simply leads the one who attempts to obey it to Jesus Christ, in order that we may accept His provision to overcome our sin problem.
The "mark" is perfection. God has provided the perfect provision for us, as we cannot attain it on our own. Faith alone in Jesus Christ alone puts us in the position that is desired not only by us, but by the One Who has made the Provision.
Believe on the Lord Jesus Christ
and thou shalt be saved.
Have a Blessed Day!