Practical Reason and Morality in Kantian Ethics
I. Practical Reason and Morality
I.1. Concept of Practical Reason
Moral behavior is linked to reason because it adheres to principles and universality. Only reason facilitates this connection. Reason has two aspects: theoretical and practical. Theoretical reason seeks to understand how things are, while practical reason concerns itself with how human behavior should be. Theoretical reason forms judgments (e.g., “A is B”), while practical reason issues imperatives or commandments (e.g., “Must do X”). Key texts include Kant’s Critique of Practical Reason and Groundwork of the Metaphysics of Morals.
I.2. The “Fact of Morality”
Kant’s ethical reflection begins with the moral experience of duty. All individuals recognize moral obligations, feeling compelled to perform certain actions and avoid others. This consciousness of duty involves a determination of the will characterized by universality and necessity. Kant argues that duty is unconditional; if an act is wrong, it is wrong in all circumstances. This mandate is experienced as absolutely necessary. Kantian ethics aims to understand this “fact of morality” and its conditions of possibility, similar to how Kant’s theory of knowledge investigates the conditions of possibility of science.
I.3. Types of Laws, Principles, or Practices
Practical principles are propositions expressing how rational beings should behave. Will is the faculty that initiates action. The basis for determining the will is the driving force behind action. In humans, two potential drivers exist: reason and inclination. Inclination refers to any empirical determination of behavior based on the subject’s empirical constitution, primarily bodily desires. Actions driven by inclination aim for the subject’s good or self-interest.
Duty presents itself as a constraining imperative: “You must do X!” Imperatives can be hypothetical or categorical. Hypothetical imperatives command action as a means to an end. Categorical imperatives command action because it is inherently good (or forbid action because it is inherently bad). Hypothetical imperatives are imperatives of skill when the end is merely possible, and imperatives of prudence when the end is real (e.g., happiness).
II. Kant’s Critique of Material Ethics
II.1. Definition of Material Ethics
Kant contrasts formal ethics with material ethics. Material ethics defines right and wrong based on a perceived highest good. Acts are good when they approach this supreme good and bad when they deviate from it. Material ethics identifies goods for humans and establishes the ultimate end. It then sets standards to achieve this end.
II.2. Hypothetical, Empirical, and Conditional Precepts
Kant argues that hypothetical imperatives cannot express moral experience because they lack universality and necessity. Moral experience involves submission to a universal and necessary moral precept. Hypothetical imperatives are contingent and particular, while morality must be universal and necessary. Empirical evidence cannot support universal and necessary prescriptions; therefore, material ethics cannot express the fact of morality.
II.3. Heteronomy of Material Ethics
Heteronomy opposes autonomy. A subject is autonomous when self-governing. Material ethics are heteronomous because they define good actions conditionally, as means to a desired end. In heteronomous actions, the subject submits to external conditions.
III. Kant’s Formal Ethics
III.1. Formalism
Kantian ethics has three key features: a rigorous standard of legitimacy, defense of the will’s autonomy, and the assertion that only actions done from duty are good. Kantian ethics is formal, contrasting with material ethics. A moral action fulfills a formal requirement: universalizability. If a maxim of conduct can be universalized, the action is good; otherwise, it is bad.
III.2. Autonomy
Kant’s ethics champions autonomy. In moral action, the basis for determining the will comes from reason, not external factors. This aligns with Enlightenment thought, emphasizing individual autonomy and reason. In moral experience, we are autonomous because the moral law originates within us.
III.3. Duty for Duty’s Sake
For Kant, duty, not inclination, is the foundation of good actions. Duty is the “necessity of action out of respect for the law.” A good action must be done from duty. Kantian rigor involves two aspects: adherence to duty even against personal happiness, and the universal nature of goodness or badness. The categorical imperative commands unconditionally, declaring an action objectively necessary without reference to any external purpose.
IV. Postulates of Practical Reason
Transcendental Idealism denies knowledge of reality itself, including metaphysical themes like God, soul, and freedom. However, Kant suggests that moral experience can connect with metaphysical reality through the postulates of practical reason. These propositions, while not demonstrable through theoretical reason, are necessary to understand the “moral factum.”
IV.1. Postulate of Freedom
Theoretical reason cannot prove freedom, as it only accesses the phenomenal world governed by causality. However, practical reason defends freedom as the condition for moral action. Actions lacking freedom are neither good nor bad, and the subject is not morally responsible. Freedom, equivalent to autonomy, is the ratio essendi (condition of possibility) of morality.
IV.2. The “Highest Good” (Supreme Good)
The highest good synthesizes virtue and happiness. Its ultimate achievement is the condition of possibility of morality. Kant believes that while happiness is not the sole basis for moral behavior, it holds significant value. This leads to his concept of the highest good, which requires an infinite time (hence the postulate of the immortality of the soul) and a God to ensure its realization.
These postulates are not objectively provable but are subjectively valid assumptions that make sense of moral experience. They lead to rational faith, a conviction based on reason, not revelation.