The Principles and Practice of Quackery

The difference between a quack doctor and a good one begins with a sense of
limitation. A quack medicine and a quack doctor both promise too much. A sound
medicine offers limited help for a limited and specific problem. It offers no
miracles and works none. it cannot replace good hygenie, sound nutrition and
healthy habits. The wise doctor makes no large promises; he knows how limited
his role is and yet, within those limits, very important. The more we demand of
a doctor or of a medicine, the more likely we are to fall prey to quackery.

Chalcedon Medical Report #7