This is very much true, but whole generations have been brought up to be their profession. I have a friend who was a priest. His whole life he had aimed at this role and invested in it, it was no longer a thing to do but his identity. Then he fell out of his belief and as a consequence suffered tremendously because his whole being was tied into that role. He's doing ok now but for a while I thought he wasn't going to make it. Of course 'priest' isn't just any job like software developer or truck driver. But still this job/identity issue is very pervasive.