The big idea: 'It turned out fine, so it was okay.' Does that sit right with you? Many people feel some acts are simply wrong, whatever the results.
Deontology in one line: Think of betraying a friend or torturing an innocent: wrong even if it somehow led to good results. That gut feeling is the heart of deontology: right and wrong come from duties and rules, not from how things happen to turn out.
Deontology comes from the Greek word for 'duty'. Where teleology looks forward to results, deontology looks at the act itself: is it the kind of thing you're allowed to do?
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The great deontologist gave a precise test for which rules count as duties.
Kant: the categorical imperative: Immanuel Kant said a true moral duty is a categorical imperative — it applies whatever your goals, not just 'if you want X, do Y'. His test: act only on a rule you could will everyone to follow.
The test on one case: lying to get a loan
State the rule
Lie to get a loan when it suits you.
Make it universal
Imagine everyone lied like that: promises would mean nothing.
Does it collapse?
Yes — the whole practice would collapse, so you can't consistently will it for all.
The verdict
The rule fails the test, so lying is a duty NOT to do, whatever the payoff.
State the rule → make it universal → does it collapse? → duty
Checkpoint — Kant: In one line: a real duty is a rule you could will for everyone; keep it whatever the consequences. Hold that — but where do such duties ultimately come from? One old answer looks upward.
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Kant grounds duty in reason. A very different tradition grounds it in God.
Divine command theory: Divine command theory says the source of moral duty is God's will: some things are duties simply because God commands them. It's still deontological — duty-based, not results-based — but the rules come from a divine lawgiver rather than from Kant's test of reason.
The famous puzzle: Does God command things because they're good, or are they good because God commands them? Neither answer is comfortable.
Go further — higher-level insight: The puzzle for divine command is the Euthyphro dilemma. If acts are good because God commands them, then goodness looks arbitrary — God could have commanded cruelty. But if God commands them because they're already good, then goodness stands on its own and doesn't need God as its source. Raising that fork is a strong evaluative move.
Checkpoint — two sources: In one line: deontology says keep your duty whatever the results — Kant grounds duty in reason, divine command grounds it in God. Same family, two roots.