I have been engaged in a Protestant/Catholic discussion with a good friend for two years now. He is a Calvinist. One of his questions I don’t know the answer to has to do with Luke 22:32.
“But I have prayed for you, Simon, that your faith may not fail. And when you have turned back, strengthen your brothers.”
The question is, did Peter’s faith fail? If it did, does this mean Jesus’ prayer was ineffective? If Peter’s faith did not fail, what are we to make of his repeated denial of Christ?
My Calvinist friend believes in Once-Saved-Always-Saved, and so the fact that Peter denied Our Lord had no bearing on his salvation. I always understood Peter’s denial to be gravely sinful, and that repenting of his sin was necessary for him to return to a state of grace. But if this is true, does it mean Christ’s prayer was ineffective?