Aristotle identifies the family (oikos) as the most basic unit of human association. It is the primary structure formed to satisfy daily needs and ensure the survival of the species. From this foundational unit, larger associations like villages and eventually the city-state emerge as human needs become more complex and social cooperation expands.

In his work 'Politics', Aristotle systematically reviewed and critiqued the political theories of his predecessors. He examined the constitutional proposals of Phaleas of Chalcedon, the urban planning and social theories of Hippodamus of Miletus, and the ideal state described by his teacher, Plato, to develop his own empirical political science.

Aristotle is renowned for his analysis of the individual as a 'political animal' who can only fully realize their potential within the context of the polis (city-state). He argued that the state is a natural development, and the individual's life is inextricably linked to the community, emphasizing the importance of civic participation for human flourishing.

The dialogue 'Eudemus' was written by Aristotle in memory of his friend Eudemus of Cyprus, who died in battle. It is one of his early exoteric works, written in the Platonic style of dialogue. While most of his early dialogues are lost, fragments and references in later works suggest it dealt with themes of the immortality of the soul and the nature of death.

Aristotle is the name of the philosopher himself. Nicomachus was the name of his father and also the name of his son, to whom he dedicated his famous work, the 'Nicomachean Ethics'. Plato's original name was Aristocles, and Machiavelli is a distinct historical figure from the Renaissance.

Aristotle's constitutionalism is rooted in the idea of the 'polity,' where the government acts in the interest of the common good and operates under the rule of law. He believed that a stable state requires the active participation of virtuous citizens. Therefore, any system that degrades the dignity or self-respect of its citizens contradicts his vision of a functional and ethical constitutional state.

In 'De Anima', Aristotle categorizes the soul into three levels: the vegetative (nutritive), the animal (sensitive/locomotive), and the rational (intellectual). The concept of the 'unconscious' is a modern psychological construct, primarily associated with 19th and 20th-century psychoanalysis. Aristotle's framework focuses on the functional capacities of living beings rather than hidden mental states or repressed drives.

In Book XII of the Metaphysics, Aristotle categorizes substances into three types: two are sensible (perishable and eternal, such as celestial bodies) and one is immovable and eternal (the divine or the unmoved mover). This classification is central to his metaphysical inquiry into the nature of reality and being.

Aristotle defined citizenship based on the capacity to participate in the deliberative or judicial administration of the state. In his view, slaves, children, and resident aliens (metics) were excluded from political participation. The concept of a formal 'clergy' as a distinct political class did not exist in the same way in ancient Greek city-states as it did in later medieval contexts, making it the least applicable category for exclusion.

Aristotle argued that the polis exists not merely for the sake of life, but for the sake of the 'good life'. The ultimate objective is to enable citizens to practice virtue and achieve eudaimonia (flourishing or excellence). While security and survival are necessary conditions, they are only the foundation for the higher purpose of moral and intellectual development.