Overview of Hume's Moral Philosophy

Moral Sentiment vs. Convention
- Hume posits that moral sentiment is intrinsic, reflecting feelings of approval or disapproval, while concepts of justice are conventions created by society.
Radical Departure from Previous Theories
- This notion contrasts sharply with preceding philosophers like Plato and Aristotle, who argue for reason as the controller of passions.

Definition and Role
- Hume views reason as a calculator, concerned with true and false claims.
- He states, "Reason is the purview of the true and false."
Notable Examples
- Examples of non-truth-apt sentences include:
- "Do you want to come out and play?"
- Commands like "Shut the door."
Truth Aptness
- Not all sentences have truth conditions; they do not convey claims about the world's nature.
Analogy
- Reason is likened to the function of a map in a car:
- "The map function shows you where things are relative to each other…but does not choose your destination."

Definition
- Passions are feelings that drive decisions and motivate actions but lack truth sensitivity.
Types of Passions
- Includes desires, aversions, and goals.
Analogy
- Passions can be seen as the drivers of a car, while reason provides a path:
- "The passions decide the destinations, while reason figures out the routes to reach those destinations."

Summary of Functions
- Reason computes options and assesses distances, but does not dictate where one should go.
Who’s in Charge?
- Hume concludes, "Passions are in charge," as they direct desires and decisions.

Nature of Morality
- Morality is found in the passions, not in reason or objective truths.
- Hume challenges traditional views of morality, stating that morality is not about judgments of truth but rather about sentiments.

Plato and Aristotle's Perspective
- Typically suggest that reason should control and regulate the passions.
Hume's Rebuttal
- Rejects the idea of suppressing passions; insists on their primacy in moral considerations.

Definition
- Hume identifies a fundamental distinction between factual claims (is) and normative claims (ought), formulating the is-ought gap:
- "There’s no proposition that is not connected with an ought or an ought not."
Implications
- This underscores a critical challenge in moral reasoning that affects philosophical inquiries into ethics.

Sentiment-Based Theory
- Hume argues that moral judgments express our emotional responses rather than objective analyses.
Example
- Evaluating actions (e.g., murder) reveals no intrinsic moral quality but reflects a societal sentiment.

Nature of Justice
- Justice pertains to property and its distribution, seen as conventional and thus artificial.
Role of Convention
- Conventions facilitate societal order and peace, forming the basis for justice without inherent moral sentiments about property.
Examples of Conventions
- Traffic laws (driving on specific sides of the road) illustrate how conventions govern behavior and maintain order despite their arbitrary nature.

Training for Justice
- Justice conventions demand training and socialization into norms, emphasizing that they do not arise from inherent moral properties.
Utility of Conventions
- Emphasizes that while some conventions may seem inefficient (e.g., speed limits), following them is necessary for societal coordination and safety.

Hume's Legacy
- Hume’s work lays the foundation for later moral theories and critiques, particularly those relating to utilitarianism and naturalistic ethics.
Impact on Ethical Theory
- His views prompt ongoing discussions about the nature of morality, the role of reason and emotion, and the significance of social conventions in ethical discourse.