The Benefit of Learning a Second Language Nobody Lists: It Turns Strangers Into Friends

Most lists of the benefits of learning a second language start with your career and your brain. The one that changed my life isn't on those lists: a second language turns strangers into friends. Speak to people in their own language, even badly, and suspicion turns into welcome. Research on how humans sort "us" from "them" explains why, and it's the reason we made a short film about it.

You can learn a language with whole sentences and audio in Taalhammer, from your first words.

Choose your language

Contents

The house at the top of the island
Why it works: language is how we decide who is "one of us"
The effort is the message
The honest limit: it opens the door, it doesn't win the argument
- Are there any disadvantages to learning a second language?
A small window into another world
"But my phone can translate for me"
What are the benefits of learning a second language?
How to get to your first "face change"
Why we made a film about this
Sources

The house at the top of the island

In 2017 I spent a month on Koh Samui, learning Thai. I was there alone. Three times a week I had a lesson with a teacher, and in between I studied on my own. At weekends I rented a car and drove the roads through the mountains, as far from the beaches as the island lets you get.

One Saturday I drove up to the top of the island, much further than I had planned. The road ended near a wooden house. A man sat in front of it and watched me get out of the car. He didn't smile. He didn't say anything. I could feel what he was thinking: who is this foreigner, and what does he want here?

I had maybe a few hundred words of Thai. Only what a beginner's course gives you in the first weeks: food, travel, who I am, where I'm from, what I do for a living. I don't remember the exact sentences. I remember what happened when he heard them.

His whole face changed. The suspicion was gone in a second, and he started talking to me. We sat there for about an hour, with my tiny vocabulary and a lot of pointing and laughing. He brought me food. He brought me drinks. For months afterwards, close to a year, we still wrote to each other.

I've spent about 30 years learning and teaching languages, and I've seen that moment many times since. But that afternoon is the one I keep coming back to. What actually happened in that second?

Why it works: language is how we decide who is "one of us"

Before he knew anything about me, my few words of Thai told him which side of a line I was standing on. That line is older than any of us.

When researchers tested this with babies, they found that we sort people by language long before we understand a single word. At five or six months, babies look longer at someone speaking their native language. At ten months, they would rather take a toy from someone who speaks it. By preschool, children pick those people as friends.

In another test, five-year-olds choosing friends cared more about a native accent than about skin colour. Language is one of the first signals humans use to decide who belongs to their group, and we never stop using it.

So when foreigners speak your language, they send that signal from the wrong side of the line. That's the surprise. For a moment, the stranger sounds like one of yours.

The effort is the message

There's a second reason, and I think it matters more. Linguists call it accommodation: we all adjust the way we speak toward the person we're talking to. When someone moves toward your way of speaking, it feels like respect, and you tend to like them for it.

Learning someone's language is the biggest move toward them you can make. It says: I spent months on something that is yours. Nobody forced me to. That's why the reaction is so out of proportion to the skill. In Thailand you'll hear phut Thai geng! ("you speak Thai well!") for three words and a wrong tone. Foreign teachers in Thailand joke that they get it for "turn left, stop here". The praise isn't for your grammar. It's for the effort.

You'll often see a Nelson Mandela language quote: "If you talk to a man in a language he understands, that goes to his head. If you talk to him in his language, that goes to his heart." It's usually credited to Nelson Mandela, but nobody has found it in his speeches or books. The earliest known appearance is a 1994 statement by the head of the Peace Corps, who said she had "seen a wonderful quote" from him. What is true is that Mandela learned Afrikaans in prison, the language of his guards. He understood the idea, even if the sentence isn't his.

The honest limit: it opens the door, it doesn't win the argument

Broken speech doesn't make you more believable. When people were tested, they rated the same trivia statements as less likely to be true when someone with a foreign accent read them out. The likely reason is effort on the listener's side: an accent is harder to follow, and what's harder to follow feels less true.

So the effect I'm describing is narrower than "speak badly and people trust you". Your effort lowers the guard and opens the door. What happens after that still depends on you. And don't overdo it in the other direction: slow, simplified "baby talk" toward people reads as condescending, which is the opposite of accommodation.

Are there any disadvantages to learning a second language?

Not many, but be honest about the cost. It takes time, usually years to reach comfortable conversation, and you'll sound like a beginner for longer than you'd like. If you're not sure it's worth it, I've written about the ways people waste years learning a language and how to avoid them.

A small window into another world

The first conversation is a door. After that, the language becomes a window. Through it you see what a translation flattens: what people joke about, how they say no without saying no, which words they use for respect. In the film below, the old woman's language has a small polite particle, ạ, that young people add when they speak to elders. Thai has its own, khrap and kha. You can't learn those from a phrasebook list and use them well. You learn them by speaking to people.

That window also makes friendships possible that wouldn't happen otherwise. If you've ever wondered how to make friends abroad, this is most of the answer. In American schools, children in bilingual English–Spanish classrooms thought more warmly of their Latino classmates, and picked them as friends more often, than children in English-only classes. Adults living abroad tell the same story: those who speak the local language get to know local people and have more people to lean on. Without the language, most expats end up with other expats. In one large survey of people living abroad, only about one in six said most of their friends were locals.

If you want the academic side of this, our article on cultural awareness in language learning goes deeper.

"But my phone can translate for me"

If an app translates everything, why learn a foreign language at all? Fair question. Translation apps are useful, and I use them too. But a translation app carries information. It doesn't carry effort, so it doesn't carry the signal.

People who study tourism noticed something decades ago, partly in Thailand: in tourist places it's usually the locals who switch to the visitor's language, the opposite of what happens with immigrants. The man on the mountain had probably spent years watching foreigners expect him to switch. When I switched instead, I broke the pattern. A phone held up between us would have kept it.

What are the benefits of learning a second language?

The benefits of learning a second language are friendship and trust with people from another culture, a deeper understanding of how they live and think, better job prospects, richer travel, and practice at seeing things from someone else's side. Claims about a general brain boost are disputed. Here are the advantages of learning a second language in one list, with the one that matters most to me first:

Friendship and trust. Speaking someone's language, even a little, changes how they see you, as above.
Understanding people from other cultures. In a 2024 survey across the EU, 45% of Europeans named this as a benefit of knowing languages, second only to jobs.
Work. Job opportunities came first in the same survey, at 51%.
Travel that goes off the map. 42% named holidays. A language turns a trip into conversations.
Seeing things from someone else's side. In one small experiment, children who simply heard a second language around them were better at seeing things from another person's point of view than children who heard only one. Treat it as a hint, not a proof.
Your brain. Does learning a second language improve brain function? Claims of a general "bilingual advantage" are disputed. We wrote up what the research really shows about bilingualism.

How to get to your first "face change"

Of all the benefits of learning a new language, this one arrives first, long before fluency. You don't need fluency for the moment I described. You need a few dozen sentences you can say without thinking, and the courage to say them to someone. Start with these:

A greeting with the polite form. In Thai that's sawatdee khrap (or kha). Every language has its version.
Thank you, and sorry. The two words that buy you patience.
"I'm learning [your language]." It explains your mistakes and makes people want to help.
Who you are and what you do. Name, country, job. That's exactly what I had on the mountain.
Food and travel. "This is delicious." "Where are you from?" "I came here by car."
"Slowly, please" and "What is this called?" They keep a conversation going when you're lost.

Learn them as whole sentences with audio, out loud, until they come out on their own. A sentence you have to build in your head is a sentence you won't say to a stranger. That's how Taalhammer teaches: whole sentences, real audio, repeated until you remember them.

Why we made a film about this

I carried the idea for a short film about this moment for about ten years. A jungle instead of a mountain, an old woman instead of a man, the same second when a face changes. Making it would have meant a crew, a location and actors in a remote place, which a small company can't do just to show a feeling.

This year AI made it possible. The draft below was generated scene by scene with AI video tools. Three exhausted travellers follow smoke through a jungle. English fails. Then one of them speaks the old woman's language, and her face changes.

That's what learning a language is really about. Not the exam, not the streak. The second a stranger hears their own language from you, and decides you're welcome.

Learn a language. Make a friend.