Universal rules — Ethics, 14–17 years
Testing a personal rule by asking whether everyone could follow it without contradiction. Ethics, 14–17 years.
Could everyone do this?
A universal rule test asks you to state the rule behind your action, then imagine everyone using it in similar circumstances. If the rule destroys the practice it relies on, or treats people as exceptions to a standard you reject for yourself, it needs rethinking. The test checks consistency, not popularity.
Why not make yourself an exception?
The problem is partiality: people can invent a convenient rule for themselves while expecting others to follow a stricter one. Immanuel Kant developed this kind of test to ask whether a maxim could guide everyone’s action. It protects the idea that moral reasons should not change merely because you are the person acting.
The borrowed phone
Suppose your rule is: “I may take a friend’s phone without asking when I want it.” Universalise it: everyone may take another person’s phone whenever they want. Trust in lending would disappear, and the rule would defeat the idea of borrowing. A better rule is “Ask before taking someone’s property, unless there is an immediate safety emergency.”
A universal test is not a slogan
A common mistake is to turn a rule into an extreme slogan, such as “never touch anyone’s property”, and then declare every exception wrong. That feels safe because simple rules are easy to remember. The real test asks about the relevant circumstances and whether the same reason could fairly guide everyone, including emergencies.
Rules in shared spaces
Before posting a group rule, sharing a classroom resource or making a promise, ask whether you would accept the same rule when someone else benefits from it. This can expose double standards in friendships, teams and online communities. It does not replace listening to people affected by the decision.
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