Final answer:
Kant's categorical imperative is the fundamental moral rule that should guide all actions, emphasizing universalizability and rationality in ethics.
Explanation:
Kant believed that the categorical imperative was not just a rough guide to action but the ultimate moral rule that should guide all actions. It is the core principle from which all other moral rules are derived. Kant's categorical imperative states, 'Act only according to that maxim whereby you can, at the same time, will that it should become a universal law.' This principle emphasizes universalizability and rationality in ethics.
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