universalizability

ethics

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July 14, 2026

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Universalizability, a concept central to Immanuel Kant's ethics, posits that moral actions should be based on principles that can be willed as a universal law. This means that a moral rule must apply to all rational beings, regardless of their personal desires or circumstances.1

R.M. Hare further developed this idea in his theory of universal prescriptivism, suggesting that moral judgments are prescriptions that must be universalizable. For a judgment to be universalizable, anyone making it must be willing to apply the same judgment to any relevantly similar situation, even if it affects them negatively. For example, if one judges a specific act of embezzlement as wrong, they must also judge any similar act as wrong, regardless of who commits it or their personal motivations. This principle serves as a logical test to reason against certain moral judgments, particularly those based on prejudice or self-interest.23

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ethics
Universal prescriptivism
…moral judgments must be “universalizable.” This notion owed something to the ancient Golden Rule and even more to Kant’s first formulation of the categorical imperative. In Hare’s treatment, however, these ideas were refined so as to eliminate their obvious defects. Moreover, for Hare universalizability was not a substantive moral…
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…moral judgments must be “universalizable.” This notion owed something to the ancient Golden Rule and even more to Kant’s first formulation of the categorical imperative. In Hare’s treatment, however, these ideas were refined so as to eliminate their obvious defects. Moreover, for Hare universalizability was not a substantive moral…
Read More

prescriptivism
Universalizability is not a substantive moral principle but a logical feature of the moral terms: anyone who uses such terms as “right” and “ought” is logically committed to universalizability.
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Universalizability is not a substantive moral principle but a logical feature of the moral terms: anyone who uses such terms as “right” and “ought” is logically committed to universalizability.
Read More