What does it mean that Abraham cannot boast before God?
Paul is saying Abraham is not justified by works.
Even if Abraham was justified by works, no one has the right to boast before God.
When Paul writes but not before God,
he is denying the major premise of the conditional. That is, he is denying the assertion that Abraham is justified by works. The fact is, Abraham is not justified by works, so he has no right to boast before God. We can detect that Paul is denying that Abraham is justified by works because he includes Abraham with the ungodly in Romans 4:5, which implies that Abraham was not able to become righteous by works. Further, we know from Romans 2:6–11 that God is impartial and gives to each according to works, but that everyone is under sin, so no one can uphold God’s law (Romans 3:9), including Abraham.
Some contend that when Paul writes not before God,
he denies the entire conditional statement. That is, these hold that Paul denies the notion that if Abraham is justified by works, he has a reason to boast. The implication is that, even if Abraham is justified by works, he still has no reason to boast before God. These make their case by the fact that Paul says in Romans 3:27–28 that boasting is excluded, not by the law of works but by the law of faith.
The problem here is that Paul also says in Romans 2:6–11 that God gives to each according to their works, implying that works entail boasting. Of course, the problem is not with boasting over works, but that because all are under sin, no one is able to do enough works to be justified. It is the notion that our sinfulness entails an inability to be justified by works, that underlies the fact that boasting is excluded.
Thus, when Paul says that Abraham cannot boast before God, he means that Abraham is not justified by works, which means he has no reason to boast.
Interpretation 1:
Paul is saying Abraham is not justified by works.
Summary:
Paul introduces a conditional statement, to deny its premise. That is, it is true that if Abraham is justified by works, he has reason to boast, but he has no reason to boast before God. Therefore, Abraham is not justified by works.
It is critical that we recognize our sinfulness so that we can appreciate God’s grace toward us. We cannot justify ourselves before God because we are sinners. Still, God saves us anyway by faith. By recognizing our sinfulness, we recognize the riches of God’s mercy, to whom we have no reason to boast.
Advocates:
Brendan Byrne
John MacArthur
Leon Morris
Thomas Schreiner
Minor differences:
Our authors agree that Paul sets up a conditional only to deny it. That is, by saying Abraham cannot boast before God, Paul is denying that Abaraham is justified by works.
John MacArthur and Thomas Schreiner get at Paul’s meaning slightly differently. MacArthur suggests that the first part of Romans 4:2 is the major premise, If Abraham was justified by works,
and it is this premise that Paul denies when he writes, but not before God.
For MacArthur, Paul admits that if Abraham was justified by works he would have reason to boast before God, but since Abraham does not have reason to boast before God, he must not be justified by works.1
Schreiner detects the same meaning in Paul, but explains it from a different angle. For Schreiner, Paul will end up categorizing Abraham as one of the ungodly in Romans 4:5. Given that Abraham is one of the ungodly, he is not justified before God by works, so he has no reason to boast.
Arguments
Possible weaknesses
Interpretation 2:
Even if Abraham was justified by works, no one has the right to boast before God.
Summary:
Paul rejects the whole idea that if Abraham was justified by works, he would have reason to boast before God. That is because God stands in a position of supremacy, so no one is able to boast before God, regardless of how they are justified.
Advocates:
Douglas Moo
Frank Thielman
Minor differences:
Our authors seem to agree that Paul is saying no one is able to boast before God, not because their works are not enough, but because of the position of God.
We can deduce that our authors both think that no one can boast before God, even if they are justified by works, because these contend that Paul denies the entire conditional in Romans 4:2. As Douglas Moo writes, all boasting in this context, whether before God or people, must be ruled out. But not before God, then, rejects the logic stated in the conditional sentence: when God’s viewpoint is considered, Abraham has no right to boast at all.
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Arguments
Possible weaknesses
2 For if Abraham was justified by works, he has something to boast about, but not before God.