“I never understand anything until I have written about it.” Supposedly Horace Walpole (1717-1797) wrote that, but Google can't help me pin down where he might have done so. Frankly, it doesn't sound to me like a sentence written in the eighteenth century. But it may be a useful hyperbole.
Track down the source of this for future use.
Related to the idea of the Feynman Technique.
