It was a happy idea of Graham Greene's to make use of elements of Cervantes' "Don Quixote" for one of his last novels, and one that led to this splendid TV film adaptation soon after in 1985. Greene's protagonist, Father Quixote, a Spanish priest, proudly refers to Don Quixote as his ancestor. His own adventures, as he travels through post-Franco Spain in his old car, named after Quixote's horse, with his companion, a former mayor whom he calls Sancho, have much of the absurdity, pathos and self-discovery of his namesake's. There is, of course, plenty of dialectic - as in most of Graham Greene works - and here it focuses on Christianity and Communism.
Dialectic does not work well in film, as a rule, but everything Sir Alec Guinness does here is perfection. Apart from the dialogue, how could one old man's face in close up convey so much!
This film has currently been hard to get and been my most expensive DVD purchase, but it's proven to be a treasure.