How to Read “百日の説法屁一つ”
Hyakunichi no seppō he hitotsu
Meaning of “百日の説法屁一つ”
This proverb expresses how long-accumulated efforts and achievements can be instantly ruined by a trivial mistake.
It depicts a situation where even magnificent sermons delivered over a long period of one hundred days can have all their effort come to nothing when the audience’s attention is diverted by just one fart. This warns of the danger that no matter how wonderful an endeavor may be, everything can become worthless if one lets their guard down at the very end or becomes careless for just a moment.
This proverb is mainly used as a warning that “one must not let their guard down until the very end.” It is employed when cautioning people who have been making long-term efforts against becoming careless in the final stages, or when expressing situations where significant achievements have been lost due to trivial mistakes. Even in modern times, we can appreciate the importance of this lesson in situations such as making a slip of the tongue at the end of a presentation or making a careless mistake in the finishing stages of a long-term project.
Origin and Etymology
The origin of this proverb is thought to have emerged from Buddhist sermon settings. Since ancient times, sermons delivered by monks have been considered sacred acts that purify people’s hearts and guide them toward enlightenment. Sermons accumulated over the long period of one hundred days were truly precious time itself for conveying Buddha’s teachings.
However, no matter how magnificent a sermon may be, as long as one is human, physiological phenomena are unavoidable. After sitting for long periods, gas may accumulate in the stomach. If at such a time one accidentally lets out a “puff” sound… the audience’s attention would instantly shift away from the sermon’s content.
This scene likely became a memorable lesson for people. No matter how wonderful the content being spoken, everything could be ruined by just one trivial mistake. This proverb expresses this human nature with humor.
While using the sacred setting of Buddhist teachings as its subject matter, the warm understanding toward human-like failures embedded within reflects the richness of the Japanese heart.
Usage Examples
- Even though it was a perfect presentation, I made a slip of the tongue during the final Q&A session, making it truly “One hundred days of preaching, one fart”
- The trust I had steadily built up over three years became “One hundred days of preaching, one fart” because of that one incident
Modern Interpretation
In modern society, the lesson of this proverb has taken on more immediate and pressing meaning. With the spread of social media, there are endless cases where just one inappropriate post instantly destroys the trust that individuals or companies have built up over many years. The “one fart” in “One hundred days of preaching, one fart” could be replaced with “one inflammatory post” in today’s context.
Particularly noteworthy is the change in the speed and impact of information dissemination. In the past, only those present at the sermon would have heard the “fart,” but now failures on the internet spread instantly around the world. The horror of a single slip of the tongue or careless action remaining permanently as a digital tattoo far exceeds what this proverb warns against.
On the other hand, modern society has also begun discussing “tolerance toward failure.” The harmful effects of demanding too much perfectionism and the importance of a culture that accepts human-like failures are being reconsidered. While applying the lesson of “One hundred days of preaching, one fart,” an attitude that values opportunities to learn from failures and make a comeback is now required.
This proverb teaches modern people “the importance of not letting one’s guard down until the very end” while also suggesting the importance of a sense of balance that “values humanity even if not perfect.”
When AI Hears This
The structure depicted in this proverb aligns remarkably with modern social media cancel culture phenomena. When a company’s trust built over years crumbles overnight due to a single inappropriate post by an employee, we’re witnessing the modern version of “a hundred days of sermons ruined by one fart.”
Particularly noteworthy is the “asymmetric destructive power” of the digital age. Mistakes that would previously only be known within limited circles now spread instantly to tens of thousands through social media. Psychological research shows that people remember negative information five times more easily than positive information, and since social media algorithms prioritize content that triggers emotional reactions, this destructive power grows exponentially.
The “temporal reversal phenomenon” of cancel culture is also fascinating. Past statements are judged by present-day values, and a tweet from ten years ago can end today’s career. This represents the destructive power of “one fart” activating across time and space.
Furthermore, cancel culture creates “perpetual collective memory.” Since information remains semi-permanently on the internet, a single mistake gets periodically “excavated” and reignites controversy repeatedly. This is a phenomenon where what used to be a “fart” that would be forgotten over time now lingers forever in digital space. This proverb brilliantly anticipated the essence of “digital reputation risk” that modern people face.
Lessons for Today
What this proverb teaches us today is both “the importance of not letting one’s guard down until the final step” and “the tolerance to accept human-like imperfection.” While striving for perfection is admirable, sometimes unexpected failures are also part of life.
What’s important is not to stop challenging ourselves out of fear of failure. Rather, this proverb contains the positive message of “that’s exactly why we should work carefully until the very end.” The monk’s effort in continuing sermons for one hundred days surely didn’t become completely meaningless because of one fart. The accumulated experience and learning will certainly be applied next time.
In modern society, slips of the tongue on social media or trivial mistakes at work can sometimes become major problems. But at such times, please remember the true meaning of this proverb. Learning from failures and growing to be more careful and more human-like. That is the warm wisdom of life that this proverb gives us.


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