Kant's Groundwork of the Metaphysics of Morals › The Categorical Imperative: First Formulation

The heart of the *Groundwork* is Kant's derivation of the categorical imperative, the supreme principle of morality that grounds all moral duties. ::: {.callout-note title="Imperative"} An imperative is a command of reason that tells us what we ought to do. *Hypothetical imperatives* tell us what to do if we want something: "If you want to be healthy, exercise regularly." *Categorical imperatives* tell us what to do unconditionally, regardless of what we want. ::: Kant distinguishes between hypothetical and categorical imperatives. Hypothetical imperatives are conditional: "If you want X, do Y." They bind you only if you have the relevant desire. If you do not want to be healthy, the command to exercise has no grip on you. Moral imperatives cannot work this way. The command "Do not murder" applies to everyone, including those who happen to dislike murder or want to avoid punishment. Moral imperatives must therefore be categorical, binding unconditionally on all rational beings. The question is: what is the content of this categorical command? Kant's answer is the formula of universal law: > Act only according to that maxim by which you can at the same time will that it should become a universal law. A maxim is the subjective principle of your action, the rule you are following. When you lie to get out of trouble, your maxim might be: "When telling the truth is inconvenient, I will lie." The categorical imperative asks: can you consistently will that everyone act on this maxim? Kant argues that immoral maxims fail this test because they generate contradictions when universalized. Consider lying promises: promising something you do not intend to do. If everyone made false promises, the institution of promising would collapse. No one would believe promises, and promises would lose their power to achieve anything. The very purpose of your lie depends on others believing promises, but if everyone lied, no one would believe. You cannot consistently will a world where your maxim is universal law. ::: {.callout-tip title="Practical Application"} When facing a moral decision, formulate the principle you're acting on and ask: "What if everyone did this?" If universal adoption would undermine the very practice you're trying to exploit, if it would make your action impossible or self-defeating, the action is morally impermissible. ::: Kant treats this as more than a prediction about consequences. He is not saying "don't lie because if everyone lied, things would go badly." He is saying that lies contain a kind of logical contradiction. They exploit a practice (promising) that would not exist if the maxim were universal. The immorality is built into the structure of the act itself.