So when I read this post Talking to Learn it made sense to me.
It reminded me of when I was in college, I would short form all my notes and then I would find an empty classroom, and I would "teach" the class what I needed to learn for my exam. I kept things in my noggin so much longer than when I silently went over and over my notes to learn them.
Mike closes his post with this line.
If you truly want to learn something in a way that it becomes part of you, then develop a lifelong habit of speaking out loud to aid in the process.