Mirabell and Millamant, equally strong-willed, discuss in detail the conditions under which they would accept each other in marriage (otherwise known as the "proviso scene"), showing the depth of their feeling for each other. Mirabell finally proposes to Millamant and, with Mrs. Fainall's encouragement (almost consent, as Millamant knows of their previous relations), Millamant accepts. Mirabell leaves as Lady Wishfort arrives, and she lets it be known that she wants Millamant to marry her nephew, Sir Wilfull Witwoud, who has just arrived from the countryside. Lady Wishfort later gets a letter telling her about the Sir Rowland plot. Sir Rowland takes the letter and accuses Mirabell of trying to sabotage their wedding. Lady Wishfort agrees to let Sir Rowland bring a marriage contract that night.