Quote by Albert Einstein
If you can't explain it to a six year old, you don't understand it yourself.

Summary
This quote suggests that true understanding of a concept can be measured by one's ability to simplify and explain it to a young child, who may lack advanced knowledge or vocabulary. The quote implies that if someone fails to articulate an idea in a simple, easily digestible manner, they may not fully comprehend the concept themselves. It highlights the importance of clarity, simplicity, and deep understanding when explaining complex ideas.