Galations 3
What purpose then
does the law
serve? It was added because of transgressions, till the Seed should come to whom the promise was made;
and it was appointed through angels by the hand of a mediator. 20 Now a mediator does not
mediate for one
only, but God is one.
21
Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe. 23 But before faith came, we were kept under guard by the law, kept for the faith which would afterward be revealed. 24 Therefore the law was our tutor
to bring us to Christ, that we might be justified by faith. 25 But after faith has come, we are no longer under a tutor.
First point: the law was a tutor to point us to Christ.
Owe no one anything except to love one another; for he who loves his neighbor has fulfilled the law. The commandments, "You shall not commit adultery, you shall not kill, you shall not steal, you shall not covet," and any other commandment, are summed up in this sentence, "You shall love your neighbor as yourself." Love does no wrong to a neighbor; therefore, love is the fulfilling of the law.
Jesus said in
Matthew 7:12, "Whatever you wish that men would do to you, do so to them; for this is the law and the prophets." James said it a bit differently (2:8), "If you really fulfill the royal law according to scripture, "You shall love your neighbor as yourself," you do well.
Second point: Love fulfills the law.
What shall we say, then? That Gentiles who did not pursue righteousness have attained it, that is, the righteousness through faith; but that Israel who pursued the righteousness which is based on law (or: who pursued the law of righteousness) did not succeed in fulfilling that law. Why? Because they did not pursue it (i.e., the law) through faith, but
as if it were based on works.
Third point: The law never commanded anyone to try to merit his salvation. The law is based on faith in God's promises, not on legalistic strivings. The mistake of Israel was not in pursuing the law, but in pursuing it by works instead of by faith.
This is a big topic. I'm just hitting a few of the high points.