Cardinal Campeggio has implored Katherine to bow to the king's will, accept that her marriage is invalid and retire to a convent. Certainly, she says sweetly, she will become a nun: if the king will become a monk.
In "Wolf Hall," Cardinal Campeggio advises Katherine to yield to King Henry's demands, encouraging her to recognize her marriage as invalid and retreat to a convent. He believes this is the best course of action to appease the king.
Katherine responds with sharp wit, sarcastically agreeing to become a nun only if the king agrees to become a monk himself. Her retort highlights her refusal to submit meekly to the pressures of the king and the church, showcasing her resilience and strong sense of identity in a tumultuous time.