Final answer:
Roland does not reveal anything specific to David at the Blouse Barn; rather, the text implies that he is secretive about his reasons for building a new barn, creating an air of mystery.
Step-by-step explanation:
The passage in question does not explicitly state what Roland reveals to David at the Blouse Barn. However, based on the context provided by the various excerpts, it appears that Roland has some secret or plan related to the erection of a new barn that he is not willing to disclose, even to his family. One might infer that the construction of the new barn could be for reasons that are not immediately clear or may be connected to deeper narrative elements that are not elaborated upon in these snippets.