To Understand Is To Teach

“Even if you’re not a teacher, be a teacher. Share your ideas. Don’t take for granted your education. Rejoice in what you learn and spray it.” -Tim Minchin

If you really want to test how well you know something, then go try and teach it to a child. 

If they don’t understand it (no matter how complex it is), you don’t fully understand it. Keep learning.

P.S. – The Feynman Technique and “Plus, Minus, Equals“