The Wisdom Audit, part 6 of 9. This series tests famous sayings against published research and ends each test with a verdict.
Three eras produced three versions of the same gospel. A second-century rabbi taught that the reward follows the pain. A colonial printer wrote that there are no gains without pains. A 1982 workout tape chanted no pain, no gain. Add the schoolroom’s practice makes perfect and 1640’s where there’s a will, there’s a way, and you have the complete effort catechism: output is a function of input, and the input is suffering.
I run programs where teenagers build real companies, so I have a professional stake in effort mattering. It does matter. The question this post asks is narrower and more useful: how much does the data say effort actually buys, and what’s buying the rest?
Practice makes perfect
Origin: The saying comes from sixteenth-century England, descended from “use makes mastery.” By 1761 it was standard enough that John Adams wrote it in his diary after fumbling a legal proceeding.
What it actually claims: accumulated practice explains who reaches expert performance.
The number in this post’s title is not a punchline. It’s the finding. In 2014, Macnamara, Hambrick, and Oswald pooled 88 studies covering every domain where deliberate practice had been measured against performance. Deliberate practice explained 12 percent of the variance in performance overall. By domain, it explained 26 percent in games, 21 percent in music, 18 percent in sports, 4 percent in education, and less than 1 percent in professions. The better the domain matches the real world, the less practice explains.
The backstory matters. Ericsson, Krampe, and Tesch-Romer’s 1993 violinist study found top performers had averaged about 10,000 hours by age twenty. Malcolm Gladwell turned that average into a threshold, the “10,000-hour rule,” and Ericsson himself objected in print: 10,000 was an average rather than a magic line, half the top group hadn’t reached it, and Gladwell had blurred deliberate practice, meaning effortful training at the edge of your ability with feedback, into mere hours logged.
Then the twin studies removed the floor. Mosing and colleagues studied 10,500 Swedish twins and found music practice itself is 40 to 70 percent heritable, and in identical twin pairs where one twin practiced more, the harder-working twin scored no better on pitch, rhythm, or melody discrimination. The drive to practice is partly the same inheritance as the ability it’s credited for.
Verdict: Fails as stated. Practice is necessary, nothing in the data makes it sufficient, and in professions, the domain most of us live in, it barely registers as a differentiator.
The rewrite: Practice makes better. Perfect was never on the menu.
No pain, no gain
Origin: Ben Hei Hei wrote in Pirkei Avot, in the second century, that the reward follows the pain. Robert Herrick titled a 1650 poem “No Pains, No Gains,” Franklin’s Poor Richard carried “there are no gains, without pains,” and Jane Fonda’s 1982 workout videos made it an anthem, complete with “feel the burn.”
What it actually claims: in the domain the modern saying actually lives in, physical training, discomfort is required for adaptation, and pain signals progress.
Exercise science has tested this directly, and it fails. Flann and colleagues put two groups through the same eight-week cycling program built around the muscle-lengthening contractions that usually cause soreness. One group ramped up gradually and showed no soreness and no spike in creatine kinase, the blood marker of muscle damage. The other started with a damaging bout and showed soreness plus CK levels more than five times higher. Muscle growth and strength gains were statistically identical at 25 versus 26 percent. The pain bought nothing.
Training to failure tells the same story. A 2021 pooled analysis of 15 trials by Grgic and colleagues found no significant difference in strength or muscle growth between training to absolute failure and stopping short. What pain does reliably predict in the sports medicine literature is injury risk, which is the one outcome guaranteed to reduce your gains.
Verdict: Fails. Pain is a cost, not a receipt.
The rewrite: No stimulus, no gain. Pain is the invoice for bad programming.
Where there’s a will, there’s a way
Origin: George Herbert’s 1640 collection includes “to him that will, ways are not wanting.” The modern wording was in circulation by the early nineteenth century.
What it actually claims: persistence predicts success independent of ability.
This one had a modern scientific revival, and then an audit. Angela Duckworth’s 2007 grit research linked perseverance plus passion to West Point retention, spelling bee performance, and GPA, with grit explaining about 4 percent of variance in outcomes. The concept went to a TED stage and into school curricula. Then Credé, Tynan, and Harms pooled the evidence across 88 samples and 66,807 people. Grit’s corrected correlation with academic performance came out at .18, and its correlation with plain old conscientiousness came out at .84. Grit, statistically, is mostly conscientiousness wearing a new jacket, and the predictive power it does have comes almost entirely from the perseverance facet (.26), not the passion-consistency facet (.10).
An r of .18 is not nothing. It’s also not a life philosophy. It’s a modest edge that we marketed as a master key.
Verdict: Conditional, and heavily oversold. Will finds ways at the margin, but it does not repeal the rest of the model.
The rewrite: Where there’s a will, there’s a slightly better chance. Bring ability, feedback, and a domain where practice pays.
What the effort literature actually supports
Read the fine print of the same studies and a consistent picture emerges. Effort pays most when four conditions line up.
| Condition | Why it matters | Evidence |
|---|---|---|
| The rules are stable | Practice compounds where the game doesn’t change, which is why games (26%) beat professions (under 1%) | Macnamara 2014 |
| The feedback is real | Deliberate practice, not repetition, was Ericsson’s whole point | Ericsson 1993 |
| The stimulus is progressive, not painful | Adaptation follows the stimulus, not the soreness | Flann 2011, Grgic 2021 |
| The timescale is years | The only part of the 10,000-hour legend that survives is the decade | Simon & Chase 1973 |
The effort catechism isn’t wrong because effort doesn’t matter. It’s wrong because it promises a conversion rate the data can’t back, and the gap between promised and actual conversion is where people burn out, blame themselves, and quit things they were 12 percent of the way into.
Next in the series: The Grass Really Is Greener.
Sources: Macnamara, Hambrick & Oswald 2014 (Psychological Science 25); Ericsson, Krampe & Tesch-Romer 1993 (Psychological Review 100); Mosing et al. 2014 (Psychological Science 25); Flann et al. 2011 (Journal of Experimental Biology 214); Grgic et al. 2021 (Journal of Sport and Health Science 11); Duckworth et al. 2007 (JPSP 92); Credé, Tynan & Harms 2017 (JPSP 113); Simon & Chase 1973 (American Scientist 61).
Laurie Stach 