Final answer:
Plato's The Republic argues for the importance of justice, morality, and the philosopher-king as the ideal form of government.
Step-by-step explanation:
Plato's work The Republic argued for the importance of justice, morality, and the philosopher-king. In the book, Plato describes an ideal city-state governed by philosopher-kings who possess both practical knowledge and a deep understanding of intellectual concepts. He believed that these philosopher-kings, who have been educated and trained from childhood to be virtuous and wise, would ensure a just society.