Commentaries:
Robertson's Word Pictures (NT)
A zeal for God (zhlon qeou). Objective genitive like Philippians 3:9, "through faith in Christ" (dia pistewv Xristou).
But not according to knowledge (all ou kat epignwsin). They had knowledge of God and so were superior to the Gentiles in privilege (Romans 2:9-11), but they sought God in an external way by rules and rites and missed him (Romans 9:30-33). They became zealous for the letter and the form instead of for God himself.
Other Robertson's Word Pictures (NT) entries containing Romans 10:2:
Acts 22:3
1 Corinthians 3:3
1 Thessalonians 2:15
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