Kant’s Philosophy of Rationality and Morality
Texts
“Every Thing in Nature…”
In this text, Kant asserts that the will, defined as the “power to choose only what reason recognizes as good, regardless of inclination,” is exclusive to rational beings. Thus, the will is equivalent to practical reason: “the will is nothing but practical reason.” Kant differentiates between natural things, which “act according to laws,” and rational beings, whose will is determined by reason, not inclination or natural laws.
“There is an Imperative That…”
Kant argues that morality’s sole imperative is the categorical imperative. Unlike hypothetical imperatives, it commands conduct unconditionally, without reference to any attainable purpose. Its formal nature “pertains not to the action’s subject matter or potential outcome, but to the manner and origin of the action itself.” Kant grounds morality not in the action’s content or intended ends, but in the principle behind it: “what is essentially good…consists in the spirit in which it is done, whatever its outcome.” This emphasizes the importance of human interiority in Kantian morality.
“Rational Beings Are Not…”
Kant reasons that if anything’s value were conditional or contingent, there could be no supreme practical principle of reason. The categorical imperative’s necessity and universality would be unfounded. Only something valuable as an end in itself (not just a means to an end) can establish unconditional practical principles—categorical imperatives with universal validity. This intrinsically valuable entity is the rational being—”rational beings are not merely subjective ends, but objective ends, things whose existence is in itself an end”—whose dignity resides in the autonomy of their will, i.e., freedom.
“When I Think a Must…”
Kant states that the categorical imperative, unlike hypothetical imperatives, is knowable a priori. Hypothetical imperatives depend on given conditions, while the categorical imperative relies on no purpose. It demands only that the action’s maxim conform to the universality of law: “it only contains the necessity that the maxims be in conformity with this law.” The challenge for humans is to ensure that any maxim guiding their will can also serve as a universal law: “Act only according to that maxim whereby you can at the same time will that it should become a universal law.” This first formulation of the categorical imperative is purely formal, unconcerned with the action’s content. The crucial element is the maxim: whatever one wills, it must be willable by all.
Historical Context
The 18th century represents the culmination of transformations leading to the modern world, culminating in revolutions like the French and Industrial Revolutions. The ancien régime, a class-based society with a primarily agricultural economy, persisted. However, political tensions grew with the rise of the bourgeoisie, who sought to dismantle a system that denied them political power and granted privileges to the nobility. These bourgeois aspirations fueled revolutions across Europe, starting with England, leading to the decline of absolutism and the rise of liberal democracies.
The triumph of modern science allowed philosophy to separate from religion. The proclamation of reason’s autonomy became central to modern thought, culminating in the Enlightenment. Crucial to the Enlightenment was absolute faith in reason as the sole authority capable of solving human problems, both theoretical and practical (“moral and political”). This confidence in reason reflected a belief in human power and the possibility of progress without divine intervention. The Enlightenment marked a shift from a God-centered order to a human-centered one.
Kant, an admirer of the American and French revolutions, defined the Enlightenment as humanity’s liberation from its self-imposed inability to use its intelligence without external guidance. For Kant, the Enlightenment’s ultimate goal was for humans to reach maturity, courageously using their own reason and achieving freedom and independence. Kant’s philosophy, situated within these Enlightenment aspirations, aimed to clarify reason’s role as the sole legitimate authority in determining what we can know, what we should do, and what we can hope for.