The main theme of the story is that intimacy involves much more than surface interaction and that it is the act of active listening which inspires understanding and devotion.
In the story, the narrator finds it perplexing that his wife is so attached to her blind friend, Robert. He is bewildered that her relationship with Robert has endured through her previous divorce and has even now encroached upon their marriage.
So, when the narrator's wife tells him that Robert is visiting, the narrator isn't especially enthused about admitting such a character into their home. After all, his wife shares an emotional intimacy with Robert that troubles him. The narrator doesn't understand why his wife finds Robert so fascinating, and it irritates him.
Awkwardly, he offers to take Robert bowling when he comes to visit, but his wife thinks that he is being patronizing. So, his offer falls flat. In fact, he and his wife seem to be at odds regarding Robert's impending visit, and this leaves him feeling helpless. The narrator decides to bide his time. When Robert arrives, the narrator is surprised when he notices how uncharacteristically cheerful his wife is in Robert's presence. Earlier in the story, the narrator tells how affected his wife was when Robert touched her face intimately all those years ago. Even now, he has no idea how the tapes his wife exchanged with Robert led to such enduring warmth and affection between the two of them.
When the narrator muses about Beulah, Robert's deceased wife, he imagines himself feeling pity for her. After all, Robert never saw what Beulah looked like, so how could he compliment her and make her feel good? The narrator is genuinely perplexed about how a blind man could have any sort of satisfying relationship with a woman under the circumstances of his disability. Here, it is clear that the narrator is oblivious to the true nature of intimacy. This brings us back to the main theme: true intimacy involves much more than surface interaction; in fact, intimacy itself is fostered by active listening and open communication. In such an atmosphere, mutual understanding is fostered.
The narrator discovers this by the end of the story when Robert guides him in drawing his personal idea of a cathedral. Before the narrator begins, Robert asks him whether he is religious. Embarrassed, the narrator admits that he is unsure about God. For his part, Robert just encourages the narrator to draw and promises that he will be there to help him. The narrator begins to draw, and he eventually becomes fascinated with the act of producing his vision of a cathedral on paper. Essentially, Robert's open acceptance of the narrator is what inspires the narrator to delve deeper into his own insecurities about faith. Robert's attentiveness to the narrator's emotions fosters an atmosphere of understanding and camaraderie, essential elements of intimacy. His ability to listen to and not to judge the narrator underlines the main theme of this short story.