Plato was a student of Socrates and the teacher of Aristotle. He founded the Academy in Athens around 387 BC. His dialogues, such as 'The Republic', remain foundational texts in political science, exploring justice, the ideal state, and the role of the philosopher-king in governance.

Socrates argues that the ideal state must be governed by 'philosopher-kings'. He posits that because these individuals possess true knowledge, wisdom, and a grasp of the 'Form of the Good', they are the only ones capable of ruling justly and prioritizing the common good over personal or factional interests, thereby ensuring the stability and virtue of the state.

Raphael Sanzio painted 'The School of Athens' between 1509 and 1511 as part of his commission to decorate the rooms now known as the Stanze di Raffaello in the Apostolic Palace in the Vatican. The fresco is a masterpiece of the High Renaissance, depicting the greatest philosophers of antiquity, with Plato and Aristotle positioned at the center of the composition to represent the synthesis of different philosophical traditions.

In the context of classical Greek political thought, particularly in Plato's 'Republic', the ideal ruler is defined as a 'philosopher-king'. This ruler is expected to possess deep wisdom, moral integrity, and a commitment to justice, ensuring that the state is governed by reason rather than personal ambition or arbitrary power. This concept emphasizes the necessity of intellectual and moral excellence in leadership.

Plato's social justice is defined by functional specialization. He argues that justice is achieved when every individual and class within the state performs the specific role for which they are best suited by nature. This harmony, where the ruling, warrior, and producing classes fulfill their duties without interference, creates a stable and just society.

This quote is attributed to Plato in his seminal work, 'The Republic'. In the opening book, Plato uses the character Cephalus to discuss the challenges of old age, suggesting that one's internal disposition and character are more significant than the physical passage of time in determining one's quality of life.

In 'The Republic', Plato defines justice as a state of harmony where each part of the soul and each class in the city performs its own specific function without interfering with others. Justice is essentially the 'functional' specialization that ensures the stability and order of the ideal state. When every individual fulfills their natural role, the state achieves true justice.

In his dialogue 'The Laws', Plato proposed that an ideal city-state should consist of exactly 5040 citizens. He chose this specific number because it is highly divisible, facilitating the organization of the state into various administrative and social units. This reflects Plato's belief in the importance of mathematical precision and order in achieving a stable, harmonious, and virtuous political community.

In 'The Symposium', the playwright Aristophanes delivers a famous speech describing the myth of humans being split into two halves by the gods. He argues that humans are driven by an inherent desire to find their other half, which serves as a metaphorical explanation for the origin of love, human connection, and the deep-seated human desire for unity and completion.

Plato, particularly in his work 'The Republic', expressed deep skepticism toward democracy. He viewed it as a volatile form of government that lacks the necessary order and expertise found in his ideal state. By describing it as 'parti-colored' and 'lawless,' he argued that democracy fails to distinguish between the wise and the ignorant, ultimately leading to social instability and the degradation of political life.