The more I study nature, the more I stand amazed at the work of the Creator. Science brings men nearer to God.

It is not the germs we need worry about. It is our inner terrain.

Chance favors the prepared mind.

If science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.

Work usually follows will.

Do not put forward anything that you cannot prove by experimentation.

When you believe you have found an important scientific fact, and are feverishly curious to publish it, constrain yourself for days, weeks, years sometimes, fight yourself, try and ruin your own experiments, and only proclaim your discovery after having exhausted all contrary hypotheses. But when, after so many efforts you have at last arrived at a certainty, your joy is one of the greatest which can be felt by a human soul.