Paul Ehrlich

"The microbe is so much smaller than ourselves that we can easily forget the fact that it stalks us all the time, waiting, and watching for the moment when we lay down our defense."

"A person who makes no mistakes has tried nothing new."

"In science there are no shortcuts to truth."

"The side-chain theory explains the formation of antibodies."

"Medicine is a science of uncertainty and an art of probability."

"Success in research depends upon the willingness to work hard."

"The true physician treats the disease; the quack treats the patient who has the disease."

"I have always believed that the task of the scientist is to search for truth."

"Knowledge comes from experience alone."

"The foundation of immunology rests upon the principle of specificity."

"One should not work on semiconductors, that is a filthy mess."

"Imagination is more important than knowledge."

"The greatest discoveries of science have always been those that forced us to reconsider our prior assumptions."

"In the laboratory, as in life, one must be prepared for the unexpected."

"Dedication to scientific inquiry demands a lifetime commitment."

"The magic bullet must be found through systematic research."

"Success requires both inspiration and perspiration."

"Nature reveals her secrets only to those who persevere."

"Truth in science cannot be rushed."

"The careful observer often sees what others miss."

"Curiosity is the engine of scientific progress."

"One must believe in the possibility before one can achieve it."

"The laboratory teaches humility to those who listen."

"Innovation comes from questioning established doctrine."

"The pursuit of knowledge is itself a noble calling."

"Patience is the virtue most essential to the researcher."

"A single observation can overturn a thousand theories."

"The mind that is open to new ideas rarely closes it again."

"In science, as in life, timing is everything."

"The greatest enemy of progress is the assumption that we already know."