It's a common sentiment. [Ernest Rutherford](https://en.wikiquote.org/wiki/Ernest_Rutherford https://en.wikiquote.org/wiki/Ernest_Rutherford) is known for the q

It's a common sentiment. [Ernest Rutherford](https://en.wikiquote.org/wiki/Ernest_Rutherford https://en.wikiquote.org/wiki/Ernest_Rutherford) is known for the quote "If you can't explain your physics to a barmaid it is probably not very good physics. "; the point being that if you can't find and explainable version of your theory, you don't really understand your theory yourself. There are also (potentially apocryphal) stories of Rutherford talking over his work with the cleaning staff as means to help himself make his own theories clearer -- the challenge of explaining it was useful in understanding it.