Louis Pasteur

I have been for a long time a chemist, and I have never ceased to be one.

To him who devotes his life to science, nothing can be more important than the study of nature.

It is by observation and experiment that we must proceed.

The more I study, the more I am convinced that the world is governed by laws, and that these laws are the work of a supreme intelligence.

The greatest triumph of science is to discover the truth.

There is no such thing as a small discovery.

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

I have always been guided by the principle that the scientist should be a man of action.

The true scientist is a man of faith.

The greatest joy of a scientist is to discover a new truth.

My only ambition is to serve humanity.

The scientific method is the only way to arrive at the truth.

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

The scientist must be a man of courage.

The greatest discovery is to discover oneself.

The greatest wealth is health.

The greatest gift is life.

The greatest happiness is to be useful to others.

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

When I am in my laboratory, I am in my element.