Final answer:
The sentence that helps understand 'recipient of confidences' additionally suggests a relationship of trust built over time. It complements the idea that being a recipient grants a person power in relationships requiring discretion.
Step-by-step explanation:
To understand the phrase recipient of confidences in the given context, the sentence that helps the reader grasp its meaning additionally is: "But now that I think further about it, I am not sure Miss Kenton spoke quite so boldly that day. We did, of course, over the years of working closely together come to have some very frank exchanges, but the afternoon I am recalling was still early in our relationship and I cannot see even Miss Kenton having been so forward." This sentence implies that a relationship built on trust and close association over time is necessary for confidences to be shared, indicating that the recipient of confidences is someone trusted with private information. It compliments the understanding that being a recipient of confidences grants a person certain power or ascendancy in relationships that value discretion and privacy.