"The microscope is our most important tool in the fight against disease."

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

"If my work has any value, it lies in the method, not in the result."

"I consider it probable that the tubercle bacillus is the actual cause of tuberculosis."

"The fight against cholera is a fight against ignorance and prejudice."