Today's challenge was by far the most interesting to me.
The sheer simplicity of the question is masked by the potential depth and complexity of the answer. Even if you are not participating in the challenge, it's worth taking a look at today's question(s) and answering them for yourself.
Here are my answers:
1. To me five years ago: You're about to go to school, but don't let that get in the way of your education (funnily enough a friend of mine from University said that to me in my final year).
2. To me five years from now: Are you still learning as much as you were five years ago? If not, you better change that.