Shared ground
Paul ends this section with a tight contrast: Gentiles who were not “chasing” righteousness nevertheless “attained” it, and the kind they attained is explicitly “of faith” (Romans 9:30). Israel, by contrast, zealously pursued “a law of righteousness,” yet did not reach its goal (Romans 9:31).
Paul also states his explanation plainly: the problem was the mode of pursuit—“not by faith, but…by works of the law”—and this mis-aimed pursuit is pictured as “stumbling” over a “stumbling stone” (Romans 9:32–33). Paul anchors the point in Scripture by citing a “stone” placed in Zion that leads some to stumble, while the one who “believes in him” will not be put to shame.
Where interpretation differs
Some disagreement shows up when readers ask what “righteousness” is in this contrast. One view takes it mainly as right standing with God (a status received through faith). Another view stresses right living / covenant faithfulness (a life shaped by trust), with “attaining righteousness” describing a new reality Gentiles enter.
A second difference is what Paul means by “a law of righteousness.” Some read it as Israel pursuing Torah as the route to righteousness (a law-based method). Others read it more as Israel pursuing a “principle/system” of law-keeping as the way to be right, not necessarily blaming Torah itself.
A third difference is the referent of “him” in “believes in him” inside the quotation. Many read Paul as applying the “stone” to the Messiah (so “him” refers to Christ as the decisive point of trust). Others emphasize that the quoted line originally speaks about trusting the Lord, and Paul’s use shows continuity between trusting God and trusting the one God has set in Zion.
Why the disagreement exists
The passage is a compressed summary, so key terms carry a lot of weight without being redefined here. Words like “righteousness” and “law” have already been used in multiple ways earlier in Romans, and Paul’s Scripture quotation comes from Israel’s Scriptures but is now used to interpret Israel’s present response. That combination creates room for different, but passage-aware, readings.
What this passage clearly contributes
Explicit claims in the text: Gentiles attained righteousness (defined here as “of faith”); Israel pursued a law-connected righteousness but did not reach it; the stated reason is pursuit “not by faith” but “as it were by works of the law”; this resulted in “stumbling” over a God-given “stone” in Zion; and Scripture already portrayed both stumbling and the promise that belief brings freedom from shame.
Theological inference tied closely to those claims: Paul frames the key divide as faith vs. works-based pursuit and presents the “stone” as God’s chosen point of decision that exposes misplaced confidence and secures the one who trusts.