"All moral laws are merely statements that certain kinds of actions will have good effects"
About this Quote
The subtext is a warning about smuggling “good” in through the back door. You can describe effects all day - pleasure, stability, reduced suffering, greater flourishing - but the moment you call those effects “good,” you’ve already made a value judgment that can’t be derived from the description alone. That’s Moore’s larger project in Principia Ethica: to resist the “naturalistic fallacy,” the habit of defining moral terms (good, right) in terms of natural or psychological properties (pleasant, desired, approved). His famous “open question” maneuver presses the point: even if an action produces pleasure, it still makes sense to ask, “Yes, but is it good?”
Contextually, Moore is pushing back against late-19th-century utilitarian confidence and the growing prestige of scientific explanation. The quote works because it sounds like a neat, deflationary insight - morality as prediction - while actually exposing a category mistake. It forces the reader to notice how easily “ought” gets disguised as “will,” and how moral language becomes persuasive precisely when it pretends to be merely factual.
Quote Details
| Topic | Ethics & Morality |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Moore, George Edward. (2026, January 17). All moral laws are merely statements that certain kinds of actions will have good effects. FixQuotes. https://fixquotes.com/quotes/all-moral-laws-are-merely-statements-that-certain-61479/
Chicago Style
Moore, George Edward. "All moral laws are merely statements that certain kinds of actions will have good effects." FixQuotes. January 17, 2026. https://fixquotes.com/quotes/all-moral-laws-are-merely-statements-that-certain-61479/.
MLA Style (9th ed.)
"All moral laws are merely statements that certain kinds of actions will have good effects." FixQuotes, 17 Jan. 2026, https://fixquotes.com/quotes/all-moral-laws-are-merely-statements-that-certain-61479/. Accessed 13 Feb. 2026.










