"The specific disease doctrine is the grand refuge of weak, uncultured, unstable minds, such as now rule in the medical profession. There are no specific diseases; there are specific disease conditions."

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We know nothing of the principle of health, the positive of which pathology is the negative, except from observation and experience. Nothing but observation and experience will teach us the ways to maintain or to bring back the state of health. It is often thought that medicine is the curative process. It is no such thing; medicine is the surgery of functions as surgery proper is that of limbs and organs.

— Florence Nightingale