12 - Never Say "That's not my job"

I've heard a lot of people say 'that's not my job.' There are various reasons why someone might say this but at the end of the day it is self-limiting and leads to you being marginalized.  If you want to be successful and grow in your career, then you need to do the complete opposite.  Instead of saying 'that's not my job', look for additional tasks that will challenge you.