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Key themes and ideas explored in "Fundamental Principles of the Metaphysic of Morals" include:The Categorical Imperative: The central concept in Kant's moral philosophy is the "categorical imperative." Kant argues that moral actions are guided by unconditional and universal moral principles that he calls categorical imperatives. These imperatives are binding on all rational beings and are not dependent on personal desires or inclinations.Autonomy and Rationality: Kant believes that morality is based on rationality and autonomy. Moral agents, according to Kant, act autonomously when they are guided by reason and are not merely following external commands or desires.Good Will: Kant identifies the "good will" as the highest and most valuable moral quality. A good will is one that acts out of duty, adhering to moral principles regardless of the consequences or personal gain.Universalizability: Kant's ethics is based on the idea of universalizability, which means that moral principles must be applicable to all rational beings. An action is morally permissible if its maxim (the principle on which it is based) can be consistently universalized without contradiction.