"The existence of microorganisms as a cause of disease is no longer a matter of theory, but a demonstrated fact."

"I believe that every disease has a specific cause, and that cause can be identified."

"The development of solid culture media was a turning point in bacteriology."

"I have no doubt that eventually we shall succeed in finding a specific remedy for tuberculosis."

"My only object has been to give the most complete description of the bacilli as they appear in the human body and in cultures."