Pelagius — on Rom 11:8 (PELAGIUS'S COMMENTARY ON ROMANS)

“The rest were hardened through unfaithfulness, as it is written: "Unless you believe, you will not understand."It is God's prerogative to give them the spirit of stupor which they desired, for they have always disbelieved the words of God. If they had wanted to have a spirit of faith they would have received it. But even today Christians who doubt the resurrection reward or Gehenna have sought a similar spirit for themselves, for in this passage the prophet was addressing both believers and sinners.”