For a long time, I wanted to work with animals/be a veterinarian. Though they are vastly different, I think teaching and the practice of veterinary medicine have a lot in common. Mainly: caring for and nurturing those who may not be able to speak for themselves, and hopefully improving each person's (or animal's) life in some way. This is truly work that is worth doing.
"The best prize that life offers is the chance to work hard at work worth doing."
-Bridge to Terabithia