Hi Orda,
The Pope is Catholic. He's saying that people like Ryan who got things completely wrong will never admit their mistake.
If people are honest and thoughtful, knowing that their economics was so catastrophically wrong as to predict inflation in a deflationary environment, and therefore making recommendations which would have been disastrous (raise interest rates to combat non-existent inflation) therefore deepening the depression - they would reexamine their beliefs.
The economics which emerged during the Depression turned out to explain things very neatly.
Okay - so the Keynesian demand view proved itself. The supply side analysis failed completely. The proponents of supply side theory will surely admit this.
Is the Pope Jewish? Of course they won't.