W.D. Ross's prima facie duties demonstrate that no single master principle (e.g., maximizing welfare) can subsume all these without systematic distortion of our considered judgments.

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Master principle(as used in ethics): The most fundamental or highest-ranking rule that guides everything else in a system—like the main rule from which all other rules follow.
Maximizing welfare(an example of a 'master principle' that critics say doesn't capture all our moral intuitions): An ethical approach that tries to make as many people as happy or well-off as possible, which is the main goal of all decisions.
Subsume(the statement argues wisdom cannot be fully contained within practical knowledge): Include or contain completely within something larger; to reduce something to a smaller category.
Systematic distortion of our considered judgments(the problem that arises when trying to reduce all ethics to one principle): When following a single rule forces you to ignore or twist the moral judgments you normally think are correct, creating a consistent but unrealistic system.

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