The most dangerous thing that can happen to us, I think, is to permit a feeling to develop that any client is a problem. I have always taken the attitude that no account is a 'problem account' but that all accounts have important problems attached to them - that you can waste more time and burn up more nervous energy by fighting a problem than by taking a positive attitude and solving it. It sure gives you a nice, warm glow when you do.

As quoted in: 100 LEO's (Leo Burnett Company), p. 75.