The best thing in the movie is Laughton simply reading from the Bible. He was a MASTER at reading a great text and drawing immense power from it. Check out on Youtube where Laughton reads The Gettysburg Address in the film Ruggles of Red Gap. I could listen to him read the phone book.
Quite right! On Laughton's reading tours he would just choose a random scattering of great texts. Sometimes Shakespeare, Bible passages, stories. Must have been a great experience to hear them. In fact, I believe there some records of them on vinyl.
There's also a story I heard about Laughton appearing on something like Ed Sullivan and being told that just hearing him read a tax invoice would be a pleasure and Laughton obliged by reading one Sullivan had in his pocket and managed to almost touch the audience with his rendering, proving Sullivan right.