The writings and the recommendations of the earliest medical scientists and the new breed of clinicians between the mid-fifteenth and early seventeenth centuries were based on the supposition that sufficient study and experimentation would elucidate not only the origins of disease, but its treatment as well.

You know, ever since man had any notion that some of his other people, his colleagues, could be different, could be strange, could be severely depressed or what we now recognize as schizophrenia, he was certain that this kind of illness had to come from evil spirits getting into the body.

The Scientific Revolution, that remarkable transformation of European thought that occurred between approximately 1550 and 1700, brought with it an ascendancy of the experimental method and the refusal to believe any explanation of natural phenomena that could not be proven to the satisfaction of the empirical observer.

Sherwin B. Nuland Quotes