Louis Pasteur

There is no greater joy than to be able to contribute to the progress of humanity.

I have a profound respect for the spiritual principle in the universe.

The more I know, the more I am convinced that I know nothing.

Life is a struggle, but a beautiful one.

Science is the highest embodiment of the nation's spirit, for the simple reason that the nation is the highest embodiment of the human spirit.

Fermentation is life without air.

The greatest aberration of the human mind is to believe that things are because they are perceived.

I am utterly convinced that there is a cause for every effect, and that this cause is always a physical one.

It is characteristic of science and progress that they continually open new fields to our vision.

The true method of discovery is to have no preconceived notions.

The more I study, the more I am filled with the desire to know.

The greatest disturbance of the human mind is to believe that things are because they are perceived.

The germ theory of disease is a new and revolutionary concept.

It is within the power of man to make parasitic diseases disappear from the surface of the globe.

I have been for a long time a partisan of the germ theory of disease.

The cause of all infectious diseases is a living organism.

The air contains a large number of germs, which are the cause of fermentation and putrefaction.

It is by the study of the infinitely small that we shall arrive at the knowledge of the infinitely great.

The scientist has a duty to be a man of action.

The germ theory of disease is not a mere hypothesis, but a demonstrated truth.