You’re at a family dinner, trying to talk about your new job or a book you’ve just finished, and someone across the table cuts in with a flat “That’s just how it is, stop overthinking.”
The air goes a bit colder.
You feel that tiny click inside: the conversation just got smaller, narrower, dumber.
We rarely say it out loud, but some sentences don’t just reveal our mood.
They quietly reveal the way we think.
Psychologists who study language and intelligence have noticed patterns: certain phrases tend to come up more often among people who see the world in black and white, who hate complexity, who score lower on tests of abstract reasoning.
The scary part?
We all use some of these phrases sometimes.
The difference is what we do next.
1. “That’s just common sense”
When someone drops “That’s just common sense,” what they often mean is: “I don’t want to think about this any deeper.”
It sounds smart, grounded, self-assured.
Yet in psychology research, this kind of phrase is linked to something called “cognitive closure” – the urge to shut down a question instead of exploring it.
You hear it at work when a process changes.
You hear it in relationships when you bring up a complex feeling.
It’s a shield, not an argument.
It suggests that if you don’t see the obvious answer, you’re the problem.
The phrase turns curiosity into a personal flaw instead of a strength.
Picture a team meeting.
The youngest employee suggests testing a new way to reach customers, something they saw on TikTok.
The manager leans back, sighs, and says: “No, we’ll stick to email. It’s just common sense.”
No data.
No question.
No attempt to understand a new reality.
In a study on dogmatic language, researchers found that people who rely on clichés like “everyone knows” or “it’s obvious” tend to score lower on measures of open-mindedness and verbal reasoning.
They avoid nuance and prefer social pressure: if you disagree, you’re not “normal.”
The phrase nudges the group to conform instead of think.
From a psychological angle, this sentence gives a comforting illusion of certainty.
If something is “common sense,” you don’t have to check facts, update your beliefs, or say “I don’t know.”
*The brain loves shortcuts, and “common sense” is one of the laziest ones.*
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Low-IQ or not, people who lean on this phrase a lot often live in small mental worlds.
They reuse the same explanations, the same excuses, the same solutions.
Language shapes thought: if your go‑to line is “it’s common sense,” you train yourself to dismiss anything that feels new or uncomfortable.
That’s how intelligence gets stuck.
2. “I already know that”
This one drops fast, like a slammed door.
You’re sharing something you learned or trying to explain a concept, and before you even reach the point, you hear: “Yeah, yeah, I already know that.”
Sometimes it’s insecurity talking.
Sometimes it’s pure ego.
Psychologists call this the “illusion of explanatory depth” – people think they understand things *way* better than they actually do.
When someone frequently cuts off explanations with “I already know that,” they block the very process that grows intelligence: updating mental models.
It’s not just rude.
It’s mentally expensive in the worst way.
Think of a friend who always insists they “know tech.”
You try to walk them through a new app or a security setting.
Before you finish the second step, they snap: “Yeah, I already know that, just tell me the shortcut.”
Ten minutes later, they’re locked out of their account.
They blame the app, the phone, “young people who overcomplicate everything.”
Studies on metacognition – the ability to think about your own thinking – show a clear trend: lower scorers often overestimate how much they understand, while higher scorers underestimate and stay curious.
The “I already know that” crowd often mistakes familiarity for mastery.
They’ve heard of something once, and in their mind, that equals expertise.
Psychologically, this phrase works like a wall.
Admitting “I didn’t know that” can feel like a threat to self-worth, especially for people who already feel judged or insecure about their intelligence.
So they double down.
They talk over teachers, interrupt colleagues, roll their eyes at tutorials.
They prefer the comfort of “knowing” to the discomfort of learning.
Let’s be honest: nobody really updates their beliefs every single day.
But people who grow over time leave a crack open: they say “tell me more,” or at least “I’ve heard a bit about this, what’s new?”
The chronic “I already know that” speaker doesn’t do cracks.
They do walls.
3. “This is how we’ve always done it”
If intelligence is partly the ability to adapt, this sentence is its enemy.
“This is how we’ve always done it” sounds loyal, practical, even protective.
Underneath, it often hides fear of change and resistance to learning.
You hear it in small family businesses when someone suggests going online.
You hear it in schools when a student brings up mental health, or in offices when someone offers a new tool.
The phrase kills innovation without having to argue on facts.
It appeals to tradition, not to reason.
Imagine a bakery passed down through three generations.
The granddaughter wants to post daily videos on Instagram and launch online orders.
Her uncle shrugs: “Your grandfather never needed that. This is how we’ve always done it.”
No test, no experiment.
Just nostalgia dressed up as wisdom.
Research on “conservative cognitive style” (not politics, but preference for stability) shows that people with lower cognitive flexibility tend to cling harder to familiar routines.
They frame change as danger rather than opportunity.
Language like “we’ve always done it this way” signals a closed feedback loop – experience is not allowed to update the system.
On a thinking level, this phrase replaces evidence with habit.
Instead of asking “Does it still work?” or “Could there be a better way?”, the person shields themselves behind history.
Low-IQ doesn’t mean low value as a human.
Yet when someone uses this line for everything, they limit what their brain is allowed to consider.
They defend methods instead of solving problems.
People who grow tend to say things like “This is how we do it now, but we’re testing alternatives.”
Those stuck in “we’ve always done it this way” are often stuck in many areas: relationships, careers, beliefs.
Their vocabulary reflects a mind on replay mode.
4. “People are just stupid / People suck”
This sentence usually comes after frustration: traffic jams, social media drama, a coworker’s mistake.
“People are just stupid.”
It sounds like a hot take, but it’s actually a lazy one.
Psychologically, it’s called global thinking: taking a small irritation and turning it into a big, sweeping judgment about humanity.
Those who repeat this line often feel powerless and use contempt as a shortcut.
Instead of understanding a system or context, they attack the entire species.
It’s not analysis, it’s an emotional outburst disguised as insight.
Picture someone scrolling through the news, reading about a scam, a political scandal, an influencer doing something absurd.
They toss the phone on the table: “See? People are idiots. The world is full of sheep.”
No nuance, no real curiosity about why people fall for scams or campaigns.
Just a big blanket insult.
Studies on verbal intelligence and empathy show a connection between richer vocabulary, better perspective-taking, and more precise criticism.
Instead of “people suck,” higher scorers tend to say things like “This system rewards bad behavior” or “Many people lack information about X.”
The insult version avoids complexity.
It feels powerful, but it explains nothing.
There’s a hidden risk in using this sentence daily: you exclude yourself from the group “people.”
You place yourself above everyone else, which often masks deep insecurity.
Over time, this mindset can become a self-fulfilling prophecy.
If everyone else is “stupid,” why listen, why learn, why verify your own ideas?
You treat your opinions as superior by default.
That’s when thinking quality drops.
Language like “people are just stupid” flattens the world into “me vs them.”
Intelligence thrives in “us,” in trying to understand motives, structures, and incentives, not just spitting on the crowd from the balcony.
How to respond without sounding like a snob
Hearing these phrases in real life can be exhausting.
And yet, jumping in with “Actually, psychology says you’re low IQ” is a great way to lose friends and start fights.
A quieter method works better.
One practical gesture: answer a closed phrase with an open question.
If someone says “That’s just common sense,” you can gently ask, “What do you mean by that, exactly?” or “How did you come to that conclusion?”
You’re not attacking.
You’re inviting them into deeper thinking without using the word “intelligence” at all.
Sometimes that small nudge is enough to shift the tone.
When a person snaps “I already know that,” you can try reflecting the resistance instead of pushing harder: “Okay, then tell me how you see it.”
This turns their ego into a resource instead of an obstacle.
With “We’ve always done it this way,” sharing a tiny, low-risk experiment can help.
Not a revolution, just: “Could we try it for one week and see the numbers?”
Concrete data can be less threatening than abstract arguments.
If you’re sensitive, these phrases might hit you like a judgment on your own curiosity.
You’re not alone.
We’ve all been there, that moment when someone’s sentence makes you feel childish for asking questions.
Try not to translate their fear of thinking into a verdict on your intelligence.
Psychologist Keith Stanovich, who studies “rational thinking”, often says that IQ is not the whole story; what really matters day to day is how willing we are to change our minds when the facts demand it.
- Notice the trigger phrase
Give it a name in your head (“ah, the ‘common sense’ card again”).
Awareness keeps you from reacting automatically. - Ask one gentle follow‑up
“Can you walk me through your reasoning?” is more disarming than “You’re wrong.”
It opens space for thought. - Protect your curiosity
If the other person keeps shutting down, exit gracefully.
“Okay, let’s park it here” saves your energy. - Use different words yourself
Swap “people are stupid” for “this situation is badly designed.”
Your brain will start looking for causes, not just villains. - Catch yourself using these phrases
We all do.
Turn them into alarms: every time you say one, pause, breathe, and add one more sentence that brings nuance.
Words that reveal how big your world is
Once you start listening, these seven‑ish phrases become like little highlighters in daily life.
On the bus, at the office, in your group chats, you’ll hear “That’s just common sense,” “I already know that,” “People are stupid,” popping up like background noise.
You might catch yourself using them too.
That’s not a crime.
It’s just a sign of mental autopilot.
The interesting part begins when you notice the moment before they leave your mouth and choose a slightly different sentence.
Instead of “This is how we’ve always done it,” you might try “This is how we do it now – is there a better way?”
Instead of “People suck,” you could say “A lot of us struggle with this,” and see what new questions appear.
The phrases we lean on reveal how much uncertainty we can tolerate, how much doubt we can live with, how much complexity we allow into our world.
You don’t control other people’s vocabulary.
You do control your own.
And that, quietly, day after day, shapes the size of your mind.
| Key point | Detail | Value for the reader |
|---|---|---|
| Spot limiting phrases | Expressions like “That’s just common sense” or “I already know that” signal closed thinking | Helps you recognize when a conversation (or your own mind) is shutting down |
| Respond with questions | Use gentle follow‑ups such as “What do you mean by that?” or “How did you decide that?” | Keeps dialogue open without attacking anyone’s intelligence |
| Upgrade your own language | Swap global judgments for precise, curious sentences | Encourages real learning, better relationships, and a more flexible brain |
FAQ:
- Question 1Does using these phrases automatically mean someone has a low IQ?Not automatically. Many smart people say them when tired, stressed, or defensive. The issue is when they become a default pattern and replace real thinking.
- Question 2Are these phrases backed by actual psychological research?Yes, they connect to studied concepts like need for closure, dogmatic thinking, cognitive rigidity, and overconfidence in one’s knowledge, all linked to lower reasoning performance.
- Question 3How can I stop myself from saying them?Start by simply noticing them. Then, each time they appear, add one extra sentence that brings nuance, like “unless I’m missing something” or “based on what I know so far.”
- Question 4What should I do if my boss constantly uses these phrases?Stay tactful. Ask clarifying questions, propose small experiments, and bring concrete data. If they still shut everything down, protect your energy and pick your battles.
- Question 5Can changing my everyday language really increase my intelligence?It can improve how you use the intelligence you already have. More precise, curious language nudges your brain to see more options, refine ideas, and learn faster.