Quote by Galen
"The physician who fears to question established wisdom will never advance medicine."
More from Galen
"Healing is a matter of time, but it is sometimes also a matter of opportunity."
"The body is a unit, and its parts are united by the single controller, the brain."
"Nature itself is the best physician."
"If you would not be forgotten as soon as you are dead and rotten, either write things worth reading or do things worth writing."