Hippocrates, The Father of Medicine

We find him possessed considerable insight into human nature. This is evident ih his argument for medicine.
“Sheer necessity has caused men to seek and to find medicine because sick men did not and do not profit by the same regimen as do men in health.” he taught.
There are some who refuse to follow standards of right living, so they lose their health, while others with weak constitutions and inherent weaknesses have to follow more intricate health guidelines than the average healthy person, simply to avoid disease, he indicated.
Source: Page 5. Food That Heals of Dr. Bernard Jensen.
The Classical Works
The great development of western medicine which occurred during the Enlightenment and modern period has its roots in the rediscovery of classical medical writings during the Renaissance. The surviving printed copies of Aristotle, Hippocrates, Galen, Discorides, Celsus and other ancient luminaries bear the editorial hand of the most eminent doctors of the day, and often the handwritten annotations of several generations of readers. Collections of early printed medical books can be compared to archaeological digs but the yield is of ideas rather than artefacts.
The value placed on these books at the time can be gauged by the biblical splendour of their production, and it can only be regarded as a small miracle that so many are collected together in the University of Sydney Library, truly Sidere mens eadum mutato.