It's good to work hard.
Petr just graduated from college and has started his first job in a field that matches his degree.
Petr wants to make good use of his college degree.
Petr knows his degree got his foot in the door but being a good employee will get him further still.
Petr takes for granted that his degree will open doors for him at his new job and doesn't push himself in his role.
Petr has a very successful career led by his degree and hard work.
Petr never gets promoted because of his low work ethic and just gets by on the initial position his degree got him.