Is this verse about salvation or about Christian works?
The verse concerns salvation, not Christian works. The context explicitly says the discussion is about salvation, not Christian experience or Christian works. It deals with trying to merit favor with God, which would put God in debt, and God owes no one anything.
Les explains that this passage is speaking about salvation, not Christian experience or Christian works. The one who “worketh” is trying to merit favor with God, and that approach would put God in debt. But God will never owe any man anything, not even a righteous man like Abraham. Les emphasizes that all are sinners by virtue of being born from Adam, and the only remedy for sin is the gospel: Christ died, was buried, shed His blood, and rose from the dead. When we believe it, just as God saw Abraham believe, God imputes His righteousness to us—none of our own, all of His.