“Conversation is a minefield until you learn the conventions, Jane dear.”
“I’ll never learn all the rules,” muttered Jane.
“Yes, you will,” said Phryne. “Then you can bend them.”

Kerry Greenwood (b. 1954) Australian author and lawyer

Phryne Fisher No. 13, The Castlemaine Murders, ch. 4 (2003)
    (Source)