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Compared

Aristotelian virtue ethics versus Kantian deontology

Both look at the person who acts and give reason a central place. Aristotle builds ethics around character and judgment. Kant builds it around duty and rules that bind everyone.

What they share

Both look at the person who acts, not only at what the act brings about, and both give reason a central place. For Aristotle what is special to humans is the activity of reason, so living well means exercising reason well. For Kant morality is a matter of reason and duty, and not of feelings or results.

Where they differ

  • Character or duty. For Aristotle the central question is what a good human life is, and the answer is built around character: virtues formed by habit, with flourishing as the final aim. For Kant the only thing good without condition is a good will, the will to act from respect for the moral law. An act has moral worth when it is done from duty, and not only in line with duty for another reason such as self-interest.
  • Judgment or a rule. Aristotle holds that judging what each situation asks cannot be done by learning general rules. It takes practical wisdom, which comes from experience and from thinking about particular cases. Kant holds that the categorical imperative binds every rational being without exception, and gives a test: act only on a rule you could will to become a universal law.
  • Happiness and outside goods. Aristotle makes flourishing the end that every other good serves, and holds that it needs good friends and some outside goods. For Kant what makes an act right is not what it brings about, and consequences do not set its moral worth.

A question that separates them

  • Person or act. “Being a good person matters more than choosing the right act” against “Doing your duty matters more than how you feel about it”.
  • Judgment or rules. “Judging each situation well matters more than following firm rules” against “Some rules bind everyone, whatever the situation”.

Scholars disagree whether Kant wants emotion left out of moral action or only wants duty to be the deciding motive, so this page does not say that Kant rejects feeling. Critics of each side raise objections, and the page takes neither side.

Written by epchē in our own words, and checked against independent sources on 8 October 2026. The sources are listed below.

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Sources we used

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