Into Great Silence (originally: Die große Stille), a nearly wordless 3+ hour documentary about the monks of a Carthusian monastery in France.

You should watch it because it makes one really feel, as much as a movie can, their lives of meditative devotional repetition. I was able to touch for just a moment the peace they strive to immerse themselves in.

(I also felt cold. Those habits cannot possibly be enough in winter.)