Niall MacGinnis (1913–1977) was Dublin-born, educated at Stonyhurst College (a Jesuit school) in Lancashire and then at Trinity College Dublin. In this 1953 portrayal of Martin Luther's life, MacGinnis does a fine job in the lead role - the movie was nominated for two Oscars. Here is his Wikipedia entry. Interestingly for Northern Ireland readers, MacGinnis had played fictional IRA leader Terence Elliott in the 1936 movie Ourselves Alone (which was directed by Belfast man Brian Desmond Hurst). MacGinnis later served in WW2 as a Royal Navy surgeon.
Go to 30 minutes:– "…and when I found it, it was as if the gates of heaven were opened to me … Christ, man only needs Jesus Christ …"