I like this line from this post.
Paul's "great sorrow and unceasing grief" was for the salvation of his fellow Jews. Do you not think that echoes the same attitude of Christ Jesus? Certainly Paul is familiar with Calvinism, is he not? At least, Calvinists believe that he taught Calvinism. If so, then how could Paul have "great sorrow and unceasing grief" in his heart for those whom God has not chosen to save? Those who die in their sin do so by the predetermined counsel and kind intention of God's will. Stop your blubbering, Paul.