ValH comments on Rationality quotes: May 2010 - Less Wrong
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"If you can't explain it simply, you don't understand it well enough." Albert Einstein
This relates well to my earlier frustration about the cop-out of vaguely appealing to life experience in an argument, without actually explaining anything.
This is something I actually struggle with a lot. I read something that strikes me as profound, and that I agree with, but as soon as I try to explain it it's all gone, and I'm left with bits and pieces that don't make much sense to anyone else.
I'm not sure if this is a failure on my part to understand, simplify an idea, or explain it.
It means that you had a deep understanding for a few seconds, and then lost it. Or that you got trapped in the same confusion as the author, absorbed what made it seem appealing, and then "corrected away" the confusion.
To determine which one happened, try the following:
Eventually, you should be able to either gain the understanding, or recognize where the error is.
This is an excellent diagnosis, and those are excellent suggestions for really learning the material.
Whenever I'm reading things that I want to actually learn and retain, I read with pencil and notebook and write down all the important points in my own words. I've found this to be helpful because it forces me to slow down and think about what I'm reading and how each new piece of information relates to everything that came before it. I've also found that having pencil and paper close at hand encourages picture drawing, which is often helpful when learning something (though it depends on what you're reading).
I had a similar problem when I read Feynman's QED. His explanation felt so simple and easy to understand when I read it, but when I tried to explain it to someone else I couldn't make it make sense.