But
it must be said from the outset that a disease is never a mere loss or excess— that there is always a
reaction, on the part of the affected organism or individual, to restore, to replace, to compensate for and
to preserve its identity, however strange the means may be: and to study or influence these means, no
less than the primary insult to the nervous system, is an essential part of our role as physicians.
— Oliver Sacks
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