Most of us have met both kinds of people at the same dinner. One talks a lot. By dessert you know their job title, what they paid for their house and how they handled a difficult boss. The other says less, asks good questions and laughs easily. Weeks later you find out they run a company, or rebuilt their life after a hard few years, or speak four languages. They just never mentioned it.

The Tao Te Ching, the short book traditionally credited to Lao Tzu (also written Laozi), has a line about this. In James Legge's 1891 translation, chapter 56 opens: "He who knows (the Tao) does not (care to) speak (about it); he who is (ever ready to) speak about it does not know it" (Legge's translation).

The words in parentheses are Legge's own additions. The Chinese is much barer, and it is usually rendered simply as "those who know don't speak, and those who speak don't know." Lao Tzu was talking about the Tao, the underlying way of things, which he thought couldn't be captured in words anyway. But the line has lasted 2,000-odd years because it fits ordinary life so well.

Historians aren't even sure Lao Tzu was a single real person, and the book may have been gathered over time. Either way, the people who seem most settled in themselves tend to live by it. Here are seven things they rarely feel the need to announce, along with what the Tao Te Ching says about each.

These seven points are modern applications of the book's ideas about humility and restraint. The distinction is between sharing something naturally and needing it to establish your worth.

1. How much they know

Picture a conversation about wine, or investing, or a medical drama everyone is watching. One person explains it all with total certainty. Another person at the table, the one who actually works in that field, mostly asks questions.

That pattern is common enough that it's almost a cliché, and chapter 71 describes it: "To know and yet (think) we do not know is the highest (attainment); not to know (and yet think) we do know is a disease."

People who know a subject well have usually seen how much of it is still uncertain. They've been wrong before, often in front of other people, and it has made them a little slower to declare things. That isn't false modesty. It's what knowing something properly tends to feel like from the inside.

A small habit that helps: before giving your opinion on something, ask one more question than you normally would. You'll often find the conversation goes somewhere more interesting than your opinion would have taken it.

2. What they've achieved

Some people find a way to work their marathon time, their promotion or their kid's school results into almost any conversation. It's usually not arrogance. More often it's a need to be seen, and most of us have done it at some point.

Chapter 24 has a memorable image for it: "He who stands on his tiptoes does not stand firm; he who stretches his legs does not walk (easily). (So), he who displays himself does not shine; he who asserts his own views is not distinguished; he who vaunts himself does not find his merit acknowledged."

Anyone who has stood on tiptoe for long knows the feeling. You can do it for a moment, but it's tiring, and the smallest nudge knocks you off balance. Constantly presenting your achievements works the same way. It takes effort to keep up, and it leaves you dependent on other people's reactions.

Quietly confident people still work hard and care about results. They just don't need the result to be noticed in order for it to count. As chapter 2 puts it, "The work is accomplished, and there is no resting in it (as an achievement)."

3. All the things they've done for others

Think of the friend who helped you move house, or the colleague who stayed late to fix your mistake before anyone saw it. The ones you remember most fondly are often the ones who never brought it up again.

Compare that with help that comes with a receipt attached. "After everything I've done for you" is one of the most deflating sentences in any family or workplace, partly because it turns a gift into a debt.

Chapter 17 describes the best kind of leaders in a way that applies to anyone who helps others: "Their work was done and their undertakings were successful, while the people all said, 'We are as we are, of ourselves!'" Chapter 10 says something similar about the Tao itself: "it does all, and yet does not boast of it; it presides over all, and yet does not control them."

A good parent, mentor or manager often works like this. The person they helped walks away feeling capable, not indebted.

Wanting appreciation is understandable. The useful question is whether you can ask for recognition or set limits directly, without turning past kindness into a debt someone must repay.

4. That they're right

There's a familiar moment at a family gathering when two people disagree about a fact, and one of them pulls out a phone to settle it. Sometimes the person who turns out to be right says, "Told you." Sometimes they just smile and change the subject.

The second person has usually figured out that winning the point rarely wins anything else. Chapter 81, the last chapter of the book, puts it bluntly: "Those who are skilled (in the Tao) do not dispute (about it); the disputatious are not skilled in it."

Chapter 22 adds a twist that's easy to miss: "It is because he is thus free from striving that therefore no one in the world is able to strive with him." It's hard to have an argument with someone who isn't trying to beat you.

This doesn't mean pretending to agree. It means you can hold your view, say it once and clearly, and let the other person keep theirs without needing a declared winner. When you're uncertain, ask, "What am I missing?" When the evidence supports your position, explain it plainly without adding "I told you so."

5. That they won't be pushed around

A boundary becomes clear through what someone says and follows through on. "I can't take that on this month" communicates more than a speech about being someone who never tolerates nonsense.

Chapter 33 draws a distinction that fits here: "He who overcomes others is strong; he who overcomes himself is mighty."

Chapter 68, which Legge translated as verse, makes the same point about conflict: "He who fights with most good will / To rage makes no resort." The person who stays calm in a tense meeting often has more influence over how it ends than the person who raises their voice.

If you want to practice this, say the boundary plainly first. Give the explanation the situation needs, without feeling obliged to keep defending the same answer.

6. What they own or earn

Most neighborhoods have someone who mentions the price of everything: the renovation, the holiday, the car. Most also have someone who drives an older car, never talks about money and turns out to be the person quietly paying for a neighbor's kid to go on the school trip.

The Tao Te Ching is wary of wealth on display. Chapter 9 says: "When gold and jade fill the hall, their possessor cannot keep them safe. When wealth and honours lead to arrogancy, this brings its evil on itself." Put plainly, the more you advertise what you have, the more of your life goes into protecting it and the image that comes with it.

Chapter 33 offers a different definition of being well off: "He who is satisfied with his lot is rich." That doesn't mean people should stop wanting to earn more, especially when money is tight. It means the feeling of having enough doesn't come from other people knowing what you have.

7. How humble or calm they are

This is the one that catches almost everyone eventually. Most of us have heard "I'm not one to brag, but..." right before a brag, and perhaps said it ourselves.

Talking about personal growth can help someone understand you. The tension appears when the label becomes a defense: "I'm a calm person, so you must be overreacting." Confidence leaves room to hear when your behavior hasn't matched your intentions.

Chapter 72 describes the sage this way: he "knows (these things) of himself, but does not parade (his knowledge); loves, but does not (appear to set a) value on, himself." And chapter 56, the same chapter as the famous line, says the person who knows will "attemper his brightness, and bring himself into agreement with the obscurity (of others)."

Attemper is an old word meaning to soften or tone down. It's a lovely image. You don't have to hide your light. You just don't need to shine it in other people's eyes.

Calm and humility are things other people notice for themselves, usually at awkward moments: a delayed flight, a rude comment, a plan that falls apart. How you handle those says more than any description of yourself could.

Quiet isn't the same as invisible

It's worth being careful not to take Lao Tzu too literally. He was writing about the Tao, not giving career advice, and the book that tells us those who know don't speak still runs to about 5,000 Chinese characters. Even Lao Tzu said something.

There are plenty of times when speaking up is the right call. In a job interview or a pay review, nobody will discover your achievements if you don't mention them. People raised to be modest are sometimes overlooked for exactly this reason. And if someone is being treated badly, staying quiet isn't wisdom.

The difference is in the reason for speaking. Stating a fact because it's useful is different from needing the room to be impressed. It's also worth remembering that quiet people aren't automatically confident ones. Some are just shy or anxious, and that's fine too. Confidence shows up less in how much someone talks and more in how little they need the response.

One place to start

In your next conversation, notice the moment you want to top someone's story with a bigger one of your own. Instead of telling it, ask them one more question about theirs.

Afterward, ask yourself whether the conversation was any worse for it. Most of the time, it's better. And the story you didn't tell will still be there if it's ever actually needed.