Dou, Gerard – Een kluizenaar, 1664 Rijksmuseum: part 4

The picture has something of this: people, man, church, god, saint, elderly, book, cross, monk, priest, cave, holy, prayer, facial hair.
Perhaps it’s a painting of a man with a long white beard sitting at a table with a book and a pen in his hand and an hourglass in front of him.