“For I bear them witness that they have a zeal for God, but not according to knowledge” (v2). Paul desperately wanted more of his Jewish brethren to be saved (v1). He saw that their problem was that they were pursuing God’s righteousness on their own terms, rather than accepting what God Himself freely offered (v3). They thought they owned their religion and its rules (v5-9), and so they were offended by “the word of faith” (v8) that simply declares “Jesus is Lord.”
“Everyone who believes in him will not be put to shame” (v11). Self-justification keeps us stuck in guilt and shame, but embracing the powerful love and forgiveness of Jesus sets us free.