Do not go where the path may lead,
go instead where there is no path
and leave a trail.
  ~ Ralph Waldo Emerson

When you cease to make a contribution,
you begin to die.
  ~ Eleanor Roosevelt

Minds, like bodies, will often fall into
a pimpled, ill-conditioned state
from mere excess of comfort.
  ~ Charles Dickens

Don't let people tell you you can't do something.
Squash their toes with your crutches!

http://www.webshots.com/g/tr/hr-sh/36752.html
http://students.cup.edu/alk4915/funny_pics.htm