Synthesized answer
The provided passages describe the contents of Plato's *The Republic* as including a discussion of the nature and application of justice, the role of the philosopher in society, the goals of education, and the effects of art upon character [1]. However, the passages do not explicitly state what questions remain unanswered within the book.
Therefore, based solely on the given snippets, it is not possible to determine what questions remain unanswered in *The Republic*. The provided text focuses on the topics addressed by the book rather than its unresolved inquiries.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Republic by Plato, Sir Henry Desmond Pritchard Lee Description: A model for the ideal state includes discussion of the nature and application of justice, the role of the philosopher in society, the goals of education, and the effects of art upon character. Categories: Philosophy Pages: 502 Snippet: A model for the ideal state includes discussion of the nature and application of justice, the role of the philosopher in society, the goals of education, and the effects of art upon character.