I've got several I try to abide by and the order in which I abide by them::

1. Do it right the first time.
2. Companies will only be loyal to you until they find someone cheaper to do the same job.
3. Stay off the radar or don't be the tallest blade of grass or don't be highest nail. There are lots with the same message.
4. Squeaky gear gets the grease. Which is odd, because it completely contradicts the one above it...

I try to stay in my specific job description as if you venture out of that and get hurt, you may not get worker's comp.