[swantonb]

There's an old saying in Asian cultures about learning.

- You do not truly understand until you "forget" what you've learned.

I know, it's weird and opposite of what Feynman Said. But it makes sense.

[a1369209993]

A less eloquent but probably more helpful translation/phasing might be:

You have not truely mastered something until you've forgotten the step-by-step process of it (and presumably had to reconstruct it by doing it and paying attention to how you do so).

(This is also why it can be hard to teach something you're very good at - often, you literally don't know (well, remember) "how to do it" in a form that's actually useful to them.)

[mod]

Does this mean you've internalized it?

I think that generally is a characteristic of something who's mastered something.

It does make sense, but I don't think it's strictly true. You can understand something without making it second nature.