Paul was so completely about salvation by grace, through faith alone. For Paul there could not be any works at all involved in salvation. He said that if salvation were of works, it could not be of grace, and if it were of grace it couldn’t be of works. His message is not what Catholics believe. I can’t imagine how a Catholic could do justice to portraying Paul truthfully. The salvation/grace message is at the very heart of Paul.
Romans 11:6
And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.