Aliena ("The Pillars of the Earth", Ken Follet)

"A wise man would not employ you as a servant. You're used to giving orders, and now you would find it very hard to be on the receiving end. Oh, I know you're willing. But all your life other's have served you, and even now you feel in your heart of hearts that things should be arranged to please you. High born people make poor servants. They are disobedient, resentful, thoughtless, touchy, and they think they're working hard even though they do less than everyone else - so they cause trouble among the rest of the staff."