“The disease of the soul is both more common and more deadly than the disease of the body. Just as medicine is the art devoted to healing the body, so philosophy is the art devoted to healing the so...”

“Popular medicine and popular morality belong together and ought not to be evaluated so differently as they still are: both are the most dangerous pseudo-sciences.”

“One of the essential qualities of the clinician is interest in humanity, for the secret of the care of the patient is in caring for the patient.”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”