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🧠Greek Philosophy Unit 16 Review

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16.3 Stoic logic, physics, and ethics

🧠Greek Philosophy
Unit 16 Review

16.3 Stoic logic, physics, and ethics

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
🧠Greek Philosophy
Unit & Topic Study Guides

Stoicism, a key school of Hellenistic philosophy, offers a comprehensive worldview. It combines logic, physics, and ethics to create a unified approach to understanding reality and living a virtuous life. The Stoics believed in a rational, ordered universe governed by divine reason.

Stoic ethics emphasizes virtue as the highest good and emotional mastery as crucial for well-being. They taught that true happiness comes from aligning oneself with the natural order through reason and self-discipline. This practical philosophy influenced many thinkers and continues to resonate today.

Stoic Metaphysics

Cosmic Order and Universal Reason

  • Logos represents the divine reason governing the universe
  • Logos permeates all of reality as a rational and creative principle
  • Universe operates according to a rational and purposeful order
  • Stoics view the cosmos as a single living organism guided by logos
  • Pneuma functions as the active, material principle animating the universe
    • Consists of a mixture of fire and air
    • Provides cohesion and unity to all matter
    • Exists in varying degrees of tension in different objects

Determinism and Fate

  • Determinism posits that all events are causally determined by prior events
  • Stoics believe in a fully deterministic universe governed by logos
  • Causal chain of events stretches infinitely into the past and future
  • Human actions and decisions are part of this deterministic framework
  • Concept of fate (heimarmene) aligns with the predetermined cosmic order
  • Stoics advocate for acceptance of one's predetermined role in the cosmos

Universal Citizenship and Interconnectedness

  • Cosmopolitanism promotes the idea of world citizenship
  • Humans share a common rationality derived from the universal logos
  • Stoics emphasize the interconnectedness of all rational beings
  • Ethical implications include treating all humans with equal moral consideration
  • Concept extends beyond national or cultural boundaries
  • Advocates for a global perspective on ethics and social responsibility

Stoic Epistemology

Knowledge Acquisition and Certainty

  • Katalepsis refers to the Stoic concept of cognitive grasping or comprehension
  • Involves a clear and distinct perception of an object or idea
  • Stoics believe kataleptic impressions provide a firm basis for knowledge
  • Process involves three stages:
    1. Initial sense impression
    2. Assent to the impression
    3. Cognitive grasp of the object
  • Katalepsis serves as a criterion for distinguishing true from false impressions
  • Stoics argue that the wise person (sage) only assents to kataleptic impressions

Self-Understanding and Ethical Development

  • Oikeiosis describes the process of self-awareness and ethical development
  • Begins with an innate sense of self-preservation and extends to others
  • Involves recognizing one's place in the cosmic order
  • Progresses through stages:
    1. Self-preservation instinct
    2. Recognition of family and close relationships
    3. Expansion to wider social circles
    4. Ultimate recognition of all rational beings as part of one's ethical sphere
  • Oikeiosis provides a foundation for Stoic ethics and social philosophy
  • Emphasizes the gradual expansion of ethical concern from self to all humanity

Control and Personal Agency

  • Dichotomy of control distinguishes between what is within our power and what is not
  • Epictetus introduced this concept as a fundamental principle of Stoic philosophy
  • Things within our control:
    • Our judgments, opinions, and attitudes
    • Our desires and aversions
    • Our voluntary actions
  • Things outside our control:
    • External events and circumstances
    • Actions and opinions of others
    • Our body and possessions
  • Stoics advise focusing efforts on what is within our control
  • Accepting external events with equanimity leads to inner peace and tranquility

Stoic Ethics

Founders and Core Principles

  • Zeno of Citium founded Stoicism in Athens around 300 BCE
  • Established the school in the Stoa Poikile (Painted Porch), giving Stoicism its name
  • Zeno's teachings emphasized living in accordance with nature and reason
  • Core Stoic ethical principles:
    • Virtue as the sole good
    • Emotions should be based on reason rather than passion
    • Wisdom involves understanding the natural order of the universe
  • Subsequent Stoic leaders (Cleanthes, Chrysippus) further developed Zeno's ideas

Virtue-Based Ethical Framework

  • Virtue ethics focuses on cultivating moral character rather than following rules
  • Stoics identify four cardinal virtues:
    1. Wisdom (sophia): practical knowledge of good and evil
    2. Justice (dikaiosyne): fair and equitable treatment of others
    3. Courage (andreia): endurance in the face of adversity
    4. Temperance (sophrosyne): self-control and moderation
  • Virtue considered the only true good, while vice is the only true evil
  • External things (wealth, health, reputation) viewed as indifferent
  • Stoics argue that virtuous actions always benefit the agent and society
  • Concept of moral progress (prokope) emphasizes continuous self-improvement

Emotional Mastery and Rational Living

  • Apatheia represents the Stoic ideal of freedom from disturbing emotions
  • Differs from apathy, instead promoting rational and appropriate emotional responses
  • Involves cultivating emotional resilience and mental tranquility
  • Achieved through:
    • Practicing mindfulness and self-reflection
    • Applying reason to evaluate impressions and judgments
    • Developing indifference to external events beyond one's control
  • Stoics argue that negative emotions result from false judgments about reality
  • Goal involves aligning one's will with the rational order of the universe

Moral Choice and Personal Responsibility

  • Prohairesis refers to the faculty of moral choice or will
  • Represents the core of human agency and moral responsibility
  • Involves the capacity to assent to or reject impressions
  • Stoics emphasize developing a strong prohairesis through:
    • Cultivating wisdom and understanding
    • Practicing rational decision-making
    • Aligning one's choices with virtue and reason
  • Concept links personal freedom with moral responsibility
  • Stoics argue that true freedom comes from making virtuous choices
  • Prohairesis plays a crucial role in Stoic ethics and personal development