Some Einstein quotes (uncited) on the topic of explaining things: https://www.azquotes.com/author/4399-Albert_Einstein/tag/understanding https://www.azquotes.c

Some Einstein quotes (uncited) on the topic of explaining things: https://www.azquotes.com/author/4399-Albert_Einstein/tag/understanding https://www.azquotes.com/author/4399-Albert_Einstein/tag/und... including (something like) the most usual one: "You do not really understand something unless you can explain it to your grandmother."