Commonly Misquoted Sayings: The Correct Wording and Real Origins

Proverbs travel by word of mouth, so they get flipped, shortened and credited to whoever sounds most impressive. “What’s the saying – measure once, cut twice?” “Did Peter Drucker really say that?” This page collects the mix-ups we see most often, with the correct wording and, where it matters, the real source.

Jump to: Flipped or mixed-up sayings · Shortened or changed proverbs · Misattributed quotes

Flipped or mixed-up sayings

Often heard	Correct wording	Why it matters
“Measure once, cut twice”	Measure twice, cut once	The flipped version describes the mistake the proverb warns against: not checking and having to cut again.
“Over-promise, under-deliver” (as advice)	Under-promise, over-deliver	“Over-promising and under-delivering” is the criticism; the advice is the reverse.
“Prepare for the worst, hope for the best”	Hope for the best, prepare for the worst	Both orders are used and mean the same thing; the second is the more common form.
“The best offense is a good defense”	The best defense is a good offense	The reversed form exists (especially in sports) but makes the opposite point: stopping the opponent wins games.
“Treat others how they treat you”	Treat others as you would like to be treated	Responding in kind is reciprocity, not the Golden Rule. If you mean “how they want to be treated”, that is the Platinum Rule.
“Opportunity favors the bold”	Fortune favors the bold	From Latin (audentes fortuna iuvat, Virgil). Louis Pasteur’s different line is “chance favors only the prepared mind” (1854).
“Don’t put off today’s work for tomorrow”	Never put off until tomorrow what you can do today	Same meaning; this is the standard English form.
“Give credit where it’s due”	Give credit where credit is due	Both are fine; “credit where credit’s due” is the common short form.

Shortened or changed proverbs

Often heard	Original	Note
“Money is the root of all evil”	“For the love of money is the root of all evil”	1 Timothy 6:10 (King James Version). The original blames greed, not money itself.
“The proof is in the pudding”	“The proof of the pudding is in the eating”	The full version makes sense: you only know if it is good by trying it.
“You can’t have your cake and eat it too”	“Would you both eat your cake and have your cake?”	John Heywood’s proverb collection, 1546. Eating first makes the logic clearer: once eaten, it is gone.
“Pride comes before a fall”	“Pride goeth before destruction, and an haughty spirit before a fall”	Proverbs 16:18 (King James Version).
“Spare the rod, spoil the child” (as a Bible verse)	“He that spareth his rod hateth his son”	Proverbs 13:24. The familiar rhyme comes from Samuel Butler’s poem Hudibras (1663).
“Curiosity killed the cat, but satisfaction brought it back”	“Curiosity killed the cat”	The “satisfaction” half is a later addition; an older form was “care killed the cat”, where care meant worry.
“Jack of all trades, master of none, though oftentimes better than master of one”	“Jack of all trades, master of none”	The reassuring second line is a modern extension, not part of the traditional proverb.
“Blood is thicker than water” originally meant the opposite	“Blood is thicker than water”	A popular claim says the original was “the blood of the covenant is thicker than the water of the womb”. No early source for that version has been found; the proverb has meant family loyalty for centuries.
“Work expands to fill the time”	“Work expands so as to fill the time available for its completion”	Parkinson’s Law, 1955.
“Premature optimization is the root of all evil”	“We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.”	Donald Knuth, 1974. The full quote is more nuanced than the slogan.

Misattributed quotes

Saying	Usually credited to	What we actually know
“If you can’t measure it, you can’t improve it”	Peter Drucker	Not found in Drucker’s writings. Lord Kelvin said something similar in 1883, and W. Edwards Deming called the strict version “a costly myth”.
“Culture eats strategy for breakfast”	Peter Drucker	No source in Drucker’s work has been found; the line spread in management circles in the 2000s.
“Keep your friends close and your enemies closer”	Sun Tzu or Machiavelli	The famous wording is from the film The Godfather Part II (1974).
“If you can’t explain it simply, you don’t understand it well enough”	Albert Einstein	No reliable source shows Einstein said it.
“Insanity is doing the same thing over and over and expecting different results”	Albert Einstein	No evidence Einstein said it. Similar wording appears in Narcotics Anonymous literature from the early 1980s.
“Comparison is the thief of joy”	Theodore Roosevelt	Widely attributed to him, but no reliable source has been found.
“Entities should not be multiplied beyond necessity”	William of Ockham	The idea is his; this Latin wording was coined later, usually traced to John Punch (1639).
“When you have eliminated the impossible, whatever remains, however improbable, must be the truth”	Often confused with Occam’s razor	This is Sherlock Holmes in The Sign of the Four (1890) – a rule about elimination, not simplicity. (And Holmes never says “Elementary, my dear Watson” in Arthur Conan Doyle’s stories.)
“Early to bed, early to rise, makes a man healthy, wealthy, and wise”	Benjamin Franklin	Franklin popularized it in Poor Richard’s Almanack (1735), but it was already in John Clarke’s 1639 proverb collection.
“A penny saved is a penny earned”	Benjamin Franklin	Franklin’s almanac actually printed “A penny saved is two pence clear”.

How to check a quote yourself

Look for a primary source: a book, speech or letter with a date. “As Einstein once said” is not a source.
Be suspicious of perfect wording. Real quotes are often clumsier than the version on a poster.
Check specialist sites such as Quote Investigator or Wikiquote’s “misattributed” sections before repeating an attribution.
When unsure, say “often attributed to”. That is the convention we follow on GoldenRules.net.