Paul Ehrlich

"In each discovery lies the seed of ten new questions; this is how science grows."

"The greatest scientific truth is that nature is infinitely more clever than any mind we bring to study it."

"Progress in understanding disease is progress in understanding the miracle of health."

"The researcher stands between ignorance and knowledge, forever defending the frontier."

"In the precise measurement of the smallest things lies the foundation for understanding the greatest."

"The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind."

"In the field of observation, chance favors only the prepared mind."

"Disease is not an entity, but a reaction of the tissues to some poison."

"The truth is like a lion; you don't have to defend it. Let it loose; it will defend itself."

"A man is not finished when he is defeated. He is finished when he quits."

"The cure for anything is salt water: sweat, tears, or the sea."

"Success is not final, failure is not fatal: it is the courage to continue that counts."

"Knowledge is the most powerful weapon against disease and ignorance."

"The only true wisdom is knowing how little you know."

"In medicine, you must always question what seems obvious."

"The future belongs to those who believe in the beauty of their dreams."

"Life is what happens when you're busy making other plans."

"Gratitude is the healthiest of all human emotions."

"The greatest threat to humanity is not disease, but ignorance."

"Time is the greatest teacher; unfortunately it kills all its students."

"To improve is to change; to be perfect is to change often."

"Perseverance is not a long race; it is many short races one after another."

"The mind is everything. What you think, you become."

"Innovation distinguishes between a leader and a follower."

"In science, there are no shortcuts to truth."

"The world breaks everyone, and afterward, many are strong in the broken places."

"Fear is the enemy of progress and the friend of stagnation."

"A physician who cannot take a good history and perform a careful physical examination is unlikely to make the correct diagnosis."

"The greatest discovery is that humans can heal themselves."

"Education is the most powerful weapon you can use to change the world."