The two fulcra of medicine are reason and observation. Observation is the clue to guide the physician in his thinking.
The doctor is the servant and the interpreter of nature. Whatever he thinks or does, if he follows not in nature's footsteps he will never be able to control her.
The origin and the causes of disease are far too recondite for the human mind to unravel them.
Let the young know they will never find a more interesting, more instructive book than the patient himself.