The essay
The claim that failure teaches more than success is popular partly because it is consoling — it turns every setback into a lesson. But the comforting version is too simple. Failure teaches nothing on its own; it teaches only when it is examined, and the same is true of success. What actually drives learning is not the outcome but the reflection we are willing to bring to it, which means we should qualify the claim rather than accept it.
History's most cited example of productive failure, Thomas Edison's thousands of failed filaments, is usually told as proof that failure instructs. But the filaments taught Edison nothing by failing; they taught him because he recorded each one and asked why it burned out. A less methodical inventor could have failed the same thousand times and learned nothing at all. The lesson lived in the examination, not in the failure.
Success, examined with the same honesty, can be just as instructive — and here the popular claim is simply wrong. A surgeon who studies why an operation went well, a team that reviews a winning campaign to find what actually drove the result, both learn as much as any failure could teach. The danger of success is not that it cannot teach but that it tempts us to skip the reflection, to assume we know why we won. That temptation, not some special property of failure, is the real reason failure often seems to teach more: pain forces the reflection that comfort lets us avoid.
The strongest version of the opposing view is that failure carries a stake success does not — it hurts, and pain is a powerful teacher. That is true, and worth conceding. But it argues for reflection, not for failure. If we could learn to interrogate our successes with the same urgency that failure forces on us, we would double the number of experiences we actually learn from.
So the relationship between failure and learning is real but indirect. Failure is not a better teacher than success; reflection is the teacher, and failure's only advantage is that it compels the reflection we would otherwise skip. The practical conclusion is not to seek out failure but to bring to our victories the same hard questions we cannot avoid asking after a defeat.