Philosophy EthicsJudging Actions by Consequences or Duties
Sage sits on a sunlit library floor holding two lanterns, one labeled outcomes and one labeled rules, comparing their light
- Define the consequences lens as judging an action by its results.
- Define the duties lens as judging an action by the rules and promises it follows.
- Explain a moral choice using each lens separately.
- Identify a situation where the two lenses reach opposite conclusions.
- Construct one reason to defend a moral judgment from each lens.
Key terms
- consequences lens
- judging an action by the results it produces, asking whether it helps more than it hurts
- duties lens
- judging an action by the rule, promise, or duty it follows, regardless of results
- moral judgment
- a considered verdict that an action is right or wrong, backed by a reason
- value conflict
- a situation where the two lenses point toward opposite conclusions about the same act
Two Lanterns, Two Reasons
The consequences lantern asks what actually happens because of an action — does it help more than it hurts? The duties lantern asks what rule, promise, or duty the action follows, treating some acts as right or wrong by the kind of act they are. Pocketing a found wallet is wrong under both: the owner suffers a real loss, and the duty not to take what belongs to others is broken. Having two independent reasons to reach the same verdict often makes a moral judgment feel especially solid.
When the Lanterns Disagree
The two lenses do not always agree, and the disagreement is where moral reasoning gets interesting. Imagine a friend asks you to keep a secret, but telling it would prevent real harm to others. The duties lantern says keep your promise; the consequences lantern might say break it to stop the greater harm. Neither lantern is automatically the winner. Picking up each lantern in order — first asking what happens, then asking what rule applies — gives you the full picture even when the answers pull apart.
Worked examples
Use both lanterns on a friend asking you to keep a harmful secret.
- Pick up the consequences lantern: ask what happens if the secret is kept versus told, and whether harm to others results.
- Note that telling could prevent real harm, so the consequences lantern leans toward breaking the promise.
- Pick up the duties lantern: ask what rule applies, and note that keeping promises is a binding duty.
- Observe that the two lanterns now point in opposite directions and name the value each one protects.
Answer: The consequences lantern favors telling to prevent harm while the duties lantern favors keeping the promise; a reasoned judgment names this conflict and decides which value carries more weight here rather than pretending the lanterns agree.
Activity
Drag each card into the lantern it belongs to: Consequences or Duties
Practice
Decide which lens is used: 'She kept her word no matter what happened next.'
Write one defense of returning a found phone from each lantern's point of view.
Common mistakes to avoid
- One lens is always the correct oneNeither lens is automatically the winner; each names a real reason, and they can reach opposite verdicts.
- The two lenses always agree on every actionThey often disagree sharply, such as when keeping a promise would allow preventable harm to others.
Check your understanding
A student donated food 'because more families would get to eat.' Which lens is she using?
Jordan returns a found phone saying 'honesty is a rule I follow no matter what happens next.' Which lens is Jordan using, and why?
Theo promised to keep a friend's secret, but telling it would stop someone from getting hurt. A duties thinker and a consequences thinker reach opposite verdicts here. What is the BEST reason to give in defense of the duties verdict?
Recap
Moral judgments can be defended through two lenses: the consequences lantern judges by results, while the duties lantern judges by the rules and promises an action follows. They sometimes agree and sometimes pull in opposite directions, and neither is automatically the winner.
Reflect
When have results and rules pointed you toward different answers?