What Would Your Keynote Be?

I was asked to be a Keynote Speaker at a local Flipped Conference in a couple weeks. I have to say I am pretty excited. I don't mind being in front of people. I really like talking with teachers to get their ideas and learning from them.
I started thinking about what I wanted my keynote to be about. I had a few ideas. Then I went to the Schoology NEXT Conference and Jennie Magiera was one of the keynote speakers. Her question at the end was, "What would your keynote be?" That got me thinking more about what I wanted to say. What was the one thing that I want other teachers to think about before school starts?
In the flipped classroom there are great questions about face to face learning and being a student in my classroom. Those that use the flipped idea have thought about those ideas. I think about Brian Bennett and Ramsey Musallam and their ideas about moving further in the classroom. These have taken me to losing control in the classroom. Giving the students the ownership of the learning. Giving up control is hard fora teacher. At least it is for me. I have been changing the balance of control toward the students for a few years now and it has helped with discipline in my class and more student engagement.
So my question for you, the reader, is what would your keynote be? What would you teach other teachers if you had the opportunity to present? And why do we not take the time to prepare something to teach to teachers so we can become an expert on the one thing we think is important in our classroom? So, what would your keynote be?