What do you think of these belief statements?

I had to come up with 10 for my final project in English this year. They were supposed to be introspective. Did I succeed?
1. I believe familes are your first true teachers and friends.
2. I believe a smile can brighten anyone’s day.
3. I believe school is just a stepping stone to the future, and you should take advantage of it while you still can.
4. I believe mistakes are an important part of life; with each one you make you learn something new.
5. I believe friends are what keep us grounded.
6. I believe you are never too young to try and never too old to give up.
7. I believe you should live your life with no regrets.
8. I believe you should never let an opportunity pass you by.
9. I believe your childhood experiences make you who you are, but you are in control of who you become.
10. I believe ‘goodbye’s’ are inevitable, so you should live in the moment and take nothing for granted.

Constructive criticism only please. :)