One of my favourite observations from Charlie Munger is his comparison of the human mind to a human egg. Once a sperm enters an ovum, a membrane forms around it to prevent other sperm from getting in.
Munger suggested that something similar happens in our minds. Once an idea takes hold, we often become resistant to alternatives. Instead of objectively examining new evidence, we begin defending what we already believe.
That thought came back to me recently when someone wrote on Substack:
"You cannot be around people that are learning and not end up wanting to learn something."
There is certainly some truth in that. Curiosity can be contagious. Spending time with people who are reading, questioning, and experimenting can inspire us to do the same.
But I am not sure it is that simple.
I have seen people surrounded by learning opportunities for years and yet remain firmly attached to ideas they accepted long ago. I have also seen people reject evidence not because they are unintelligent, but because the evidence challenged something they had come to regard as settled truth.
The reading debate provides many examples. Some phonics advocates insist that high-frequency words should not be memorised because almost all can be decoded phonetically. I understand the argument. Yet when teaching a struggling beginner, I have often found it easier to help the child rote memorise words such as on and no. The child can begin reading immediately. The explanation for why the letter o represents different sounds can come later.
My purpose is not to argue against phonics. I teach phonics myself. Rather, it is to illustrate how easily educational discussions can become debates about doctrine rather than practical questions about what helps a child read.
That is why another Munger observation resonates with me:
"It is remarkable how much long-term advantage people like us have gotten by trying to be consistently not stupid, instead of trying to be very intelligent."
The goal is not brilliance. The goal is avoiding obvious mistakes. It requires the humility to ask:
· What if I am wrong?
· What evidence would change my mind?
· Am I defending a belief or seeking the truth?
Over the years I have watched educators defend Whole Language, Balanced Literacy, Science of Reading, and phonics with almost religious conviction. Researchers quote researchers. Experts quote experts. Yet the question that matters most is often forgotten:
Does this help the child in front of me?
For more than fifteen years I have worked with children who had stopped believing they could learn to read. These were not unintelligent children. They were often among the most curious children I knew. They asked endless questions about the world around them. Yet when a reading lesson began, the questions stopped. Confidence disappeared. Curiosity retreated.
That experience taught me something important. A theory may explain part of the problem. A diagnosis may explain part of the problem. Research may explain part of the problem. But if a child cannot read, our first obligation is not to defend the theory. Our first obligation is to help the child.
Another Munger quote comes to mind:
"It is not the bad ideas that do you in. It is the good ideas you have that you don't act on."
The most dangerous ideas are often good ideas that become unquestionable. Phonics is a good idea. Reading aloud to children is a good idea. Building vocabulary is a good idea. Teaching common words is a good idea. The danger begins when any of them becomes an ideology.
Looking back, I am increasingly persuaded that the greatest obstacle to learning is not ignorance. Ignorance can be corrected. The harder challenge is certainty.
Certainty closes doors. Certainty stops questions. Certainty turns exploration into defence.
Perhaps that is why Munger's human egg analogy continues to resonate. The real advantage does not come from being extraordinarily intelligent. It comes from remaining willing to say:
"Perhaps I need to reconsider what I think I know."
In reading instruction, as in many other fields, the greatest barrier is often not a lack of evidence. It is the membrane that forms around our beliefs after the first idea gets in.

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