The law is not by faith in the sense that
faith rests on Christ’s obedience, while the law calls for one’s own obedience; or
faith is what established the covenant, while the law is how the covenant is maintained.
When Paul says the law is not by faith, it is important to look ahead to Galatians 3:19–25 where he clarifies his point. First, in Galatians 3:19 Paul explains that the law was given to uncover sin. This means that the law had a different function than faith in salvation history. Next, in Galatians 3:21 he explains that the law is unable to make anyone alive. This is because all who rely on the law are cursed (Galatians 3:10), because relying on the law implies maintaining the whole law, and this is not possible for sinful humans. Finally, Paul explains that the solution to humanity's problem is not the law, but faith in Christ (Galatians 3:22). In other words, the law has to do with relying on one’s own works, which are never sufficient, while faith has to do with relying on Christ’s work.
We can also detect the difference between faith and works by the contrast Paul makes between faith and works in Galatians 3:11 and Galatians 3:12. He quotes Habakkuk 2:4 to state that the justified will live by faith (Galatians 3:11). He then explains that the law is not by faith, before quoting from Leviticus 18:5, writing that the one who does the law will live by them. So the law has to do with doing,
and the law is not by faith. If the law is not by faith, and the law has to do with doing,
what does faith have to do with? Paul already explained in Galatians 3:6 that Abraham believed God and it was counted to him as righteousness. And the sons of Abraham are the men of faith (Galatians 3:7). This means that faith has to do with believing. So the difference between he law and faith is that the law has to do with doing,
and brings curse, while faith has to do with believing, which brings life.
Some authors think Paul has a wholly different point in mind. These others contend that Paul is not interested in showing the deficiency of the law in light of sinful human nature, but the order of the law in terms of the covenant relationship with God. It’s not that the law is deficient, but Paul is concerned that the Judaizers are prioritizing the law over faith. This is a mistake because the covenant with God was established when Abraham believed God, so the covenant is established on faith. It is then maintained by works of the law. Paul feels that the Judaizers have lost sight of the priority of faith in the covenantal relationship, so they try to persuade the Galatian Gentiles to follow their deficient theology.
The problem with this interpretation is that it overlooks the fact that Paul has salvation, not Israelite history, in mind. While it might be true that God established the covenant on faith, and the covenant was supposed to be maintained by the law, this setup was deficient. Paul makes this clear when he says that all who depend on works of the law are cursed (Galatians 3:10). They are not cursed because they mixed up the order of faith and the law, but because humans are sinful, so no one will be justified before God by the law (Galatians 3:11). Paul even explains that the function of the law was not to save, but to reveal sin (Galatians 3:21), and that salvation comes through faith in Christ (Galatians 3:22).
The law is not by faith because the law has to do with depending on one’s own works, and since human works are tarnished by sin, relying on the law brings a curse. Jesus, on the other hand, obeys the law perfectly, and by believing in his work, we share in the promised eternal inheritance.
Interpretation 1:
Faith rests on Christ’s obedience, while the law calls for one’s own obedience.
Summary:
Anyone who relies on the works of the law in order to be justified before God is under a curse, because no one is able to fully abide by the law (Galatians 3:10). The law calls for obedience, and obedience is never perfectly attained. Faith, on the other hand, has to do with believing in Christ and his work.
Humans are sinful by nature. This means we cannot obey God perfectly unless we are glorified. Until that happens, God calls us to place our faith in Jesus Christ. Even though we fall short of God’s laws, we can repent, ask for forgiveness, and trust in Christ’s perfect obedience. Only through faith in Christ are we justified before God.
Advocates:
Ronald Fung
Richard Longenecker
Frank Matera
Douglas Moo
Thomas Schreiner
Minor differences:
All our authors agree that when Paul says that the law is not by faith, his point is that the law and faith are opposing principles. Both are meant to justify one before God, but only faith is effective. That is because the sinfulness of human nature entails that the law is never performed perfectly, and God’s nature is such that, to be in a proper relationship with him, perfection is required.
There is a subtle but interesting difference between Douglas Moo and Ronald Fung on the one hand, and Thomas Schreiner on the other. Moo and Fung argue that when Paul says the law is not by faith, he has two points in mind. First, he wants the Galatians to understand that being justified before God on the basis of the law is not possible.1 This is because only faith gives life.2 Second, the law cannot be upheld because of human weakness.3,4 In other words, the law, whether it could be maintained or not, is simply not a means of justification before God.
On the other hand, for Schreiner, there does not seem to be any problem with the law in itself. The problem is with the fact that humans are unable to uphold the law. In other words, if one could uphold the law perfectly, one would be justified before God.5
It is not easy to decide which of these views is accurate. We know that the law of God is good (Romans 7:12) and has to do with loving God with all our heart, soul, mind, and strength. So it is hard to see why, if one obeyed the law perfectly, one would not be justified before God. In other words, faith seems to be a necessary but not sufficient condition for obeying the law perfectly. Still, Paul hints at the notion that in fact, the law was never meant to bring life (Galatians 3:21).6
Arguments
Possible weaknesses
Interpretation 2:
Faith is what established the covenant, while the law is how the covenant is regulated.
Summary:
When God made a covenant with Abraham, and subsequently Israel, that covenant was established on the basis of faith (on the human side). Faith is the foundation of relationship with God. The law explains the actions one takes in order to observe the covenant. Thus, the law is not by faith. Faith establishes the relationship, while the law regulates it.
Advocates:
James Dunn
Arguments
Possible weaknesses
12 But the law is not of faith, rather “The one who does them shall live by them.”