The easiest person to fool

Imagine Rohan takes a test and is sure he did brilliantly. When the marks come, they are low. His first thought is not "maybe I made mistakes." It is "the teacher marked it wrong," or "the questions were unfair." He does not want the low mark to be true, so a little voice inside quietly argues it away.

We all have that little voice. It does not lie to hurt us - it lies to make us feel good. It tells us what we wish were true, and it defends whatever we already believe. And because the voice lives inside our own head, we trust it completely. That is what makes it so dangerous.

Charlie Munger warned about this again and again. He liked a line from the scientist Richard Feynman: "The first principle is that you must not fool yourself - and you are the easiest person to fool." Munger said the smartest people are often fooled worst of all, because they are so clever at inventing reasons to believe what they want. This study is about catching your own mind in the act, and learning to argue against yourself on purpose.

Two habits of the mind cause most of the trouble. The first is that we believe what we wish were true. If we hope a thing is good, our mind quietly collects every reason it might be good and ignores the reasons it might be bad. The second is that we fall in love with our first idea and cling to it, long after the facts have changed - like insisting your first answer in an exam is right even as you spot mistakes in it.

Put these together and you get a person staring into a kind of magic mirror that shows them, not the truth, but whatever they were hoping to see.

Now see how this bites an investor. Suppose Asha has bought a share. From that moment, a quiet change happens in her mind. She wants the share to do well, so now she is no longer a fair judge of it. When good news comes, she cheers and remembers it. When bad news comes - sales are falling, debt is rising - the little voice whispers, "that's not important," or "it will recover," and she looks away. She is not being stupid. She is doing what almost every human does: defending the thing she owns and the choice she already made.

So the reading skill Munger taught is the opposite of comfortable. Do not gather reasons you are right. Go hunting for reasons you are wrong. Be your own toughest critic. When you own something, deliberately search out the bad news and force yourself to look straight at it. Munger even said you do not really deserve to hold an opinion until you can argue the other side better than the people who disagree with you. The cure for the wishful mirror is to turn around, on purpose, and stare hard at the facts you were hoping to avoid.

illustrative Kabir buys a share in a company called Bright Motors because he loves their scooters. From day one, he is quietly on the company's side. For a while things go fine, and every small piece of good news makes him feel clever.

Then the warning signs begin. The company's sales slip for three seasons in a row. A new rival launches a better scooter for less money. The company borrows more and more just to keep going. These are real, solid facts, sitting right there in the reports.

But Kabir has fallen into the wishful mirror. He explains away every bad sign. "One bad season, that's normal." "Their next model will fix it." "Everyone still knows the brand." Each excuse lets him keep believing what he wishes were true. He is not lazy - he actually reads the news - but he reads it like a lawyer defending a friend, hunting only for the good bits.

Now imagine Kabir did the Munger thing instead. Each month he sits down and asks one hard question: "What are the strongest reasons I am wrong about Bright Motors?" That single question forces the falling sales and the rising debt into the centre of his view, where he cannot look away. He might still decide to hold - but now it is a real decision made with open eyes, not a comfortable dream. The facts never changed. The only thing that changed was whether he was brave enough to look at them.

Doubting everything is its own trap. If you hunt so hard for reasons you are wrong that you can never trust any decision, you freeze and do nothing. The goal is not endless self-doubt. It is to look honestly at the bad news and then still decide. Being your own critic is a tool for seeing clearly, not a reason to be scared of every choice.

You can fool yourself in the gloomy direction too. Wishful thinking usually makes us too hopeful, but fear can do the reverse - making us believe scary things that are not really true, so we run from something good in a panic. The cure is the same either way: look at the actual facts, not at the feeling. Ask what the evidence really says, whether you are hoping or dreading.

Knowing about the trick does not switch it off. This is the hardest part. Even after you learn all about self-deception, your mind keeps doing it - the little voice does not go quiet just because you named it. That is why Munger did not rely on willpower alone. He built habits: writing down the reasons he might be wrong, and welcoming people who disagreed with him. You cannot simply decide to stop fooling yourself; you have to set traps to catch yourself in the act.

This is the most human idea of all, so it transfers completely - an Indian student, a farmer, a billionaire, everyone has the same wishful mirror inside them, because it is simply how the human mind is built. Nothing about it depends on which country you live in. In our markets the mirror gets extra help: a WhatsApp group full of people who all own the same share will happily supply you with reasons you are right and shout down anyone with bad news. So the discipline matters even more here. Make it a plain habit - for anything you own or want to buy, write down, in your own words, the strongest reasons you might be wrong, and go looking for the person who disagrees with you instead of the crowd that agrees. In a world eager to sell you a comfortable reflection, the person who turns around and looks at the hard facts has a quiet, rare advantage.

• Ask 'why might I be wrong?' on purpose. For anything you own or like, hunt for the strongest reasons against it - not the reasons you are right.
• Notice when you are explaining away bad news. If you keep saying "that doesn't matter" about real facts, the wishful mirror may be working on you.
• Watch for love of your first idea. Clinging to your first opinion after the facts have changed is a classic way we fool ourselves.
• Seek out the person who disagrees. Instead of the crowd that agrees with you, find the argument against you and try to understand it fully.
• Write it down, don't just think it. Putting the reasons-you-might-be-wrong on paper is a habit that catches the mind in the act - willpower alone is not enough.