The film dramatizes about a dozen vignettes from the life of St. Francis and his early followers - starting with their return in the rain to Rivotorlo from Rome when the Pope blessed their Rule and ending with their dispersal to preach.
Rossellini had a strong interest in Christian values in the contemporary world. Though he was not a practicing Catholic, Rossellini loved the Church's ethical teaching, and was enchanted by religious sentiment —- things which he felt were neglected in the materialistic world. I can appreciate this. While I am also not a practicing Catholic, I was raised in the tradition and love the rich history of the Church. Though the tenets are not for me, the values are universal and it is interesting to see how they have been carried out, in this case by creating an entire Order of priests.
The look of this film is beautiful, the black and white as stark and striking as the best Scandinavian films. In the era of the neo-realist Italian film, this really has the perfected look, and can be enjoyed both for its great storytelling and just its glorious imagery.