"I certainly have not the talent which some people possess," said Darcy, "of conversing easily with those I have never seen before. I cannot catch their tone of conversation, or appear interested in their concerns, as I often see done."

Darcy's inability to converse easily may appear to be a fault, but it seems that those that can speak well either make or bring some sort of trouble.

The Bingley Sister
Their powers of conversation were considerable. They could describe an entertainment with accuracy, relate an anecdote with humour, and laugh at their acquaintance with spirit. Chapter 11

The Superior sisters are masters at conversation yet they are the ones Elizabeth holds responsible for the separation of her sister and Bingley.

she had always attributed to Miss Bingley the principal design and arrangement of [the measures taken to separate Mr. Bingley and Jane] Chapter 33

Col. Fitzwilliam is also noted for having an ease in conversation.

Colonel Fitzwilliam entered into conversation directly with the readiness and ease of a well-bred man, and talked very pleasantly; but his cousin, after having addressed a slight observation on the house and garden to Mrs. Collins, sat for some time without speaking to anybody. Chapter 31

Yet he is the one who tells Elizabeth of Darcy's success in separating Jane and Bingley.

"And remember that I have not much reason for supposing it to be Bingley. What he told me was merely this: that he congratulated himself on having lately saved a friend from the inconveniences of a most imprudent marriage, but without mentioning names or any other particulars, and I only suspected it to be Bingley from believing him the kind of young man to get into a scrape of that sort, and from knowing them to have been together the whole of last summer."

"Did Mr. Darcy give you his reasons for this interference?"

"I understood that there were some very strong objections against the lady." Chapter 33

Mr. Darcy is noted for not speaking much in most cases, but look at the time he is noted for speaking well.