Final answer:
The Mistresses of the Palace Beautiful show Christian mirrors reflecting their own souls.
Step-by-step explanation:
The Mistresses of the Palace Beautiful show Christian mirrors reflecting their own souls. In John Bunyan's book 'The Pilgrim's Progress', the Palace Beautiful represents the church, and the Mistresses are the caretakers of the church. By showing Christian mirrors reflecting their own souls, the Mistresses are helping him examine his own spiritual condition and encouraging him to reflect on his faith and actions.