an encouragement to kids going back to school

Your dreams are not guaranteed to come true.  You do not have unlimited potential and all that crap.  You have limited time and potential.  But unless you have dreams and pursue them, you will never know if you can make them come true.  So it's better to have dreams and try hard to make them come true than to deny yourself and automatically fail by eliminating even the chance of success.  Probably.  : )