Louis Pasteur

I am a physicist and a chemist, and my laboratory is the universe and the world of life.

Without theory, practice is but routine born of habit.

In scientific work, one should not be too anxious about immediate utility. Knowledge must be sought for its own sake.

I am a man of the laboratory; I have never been a man of the world.

The infinitely small is infinitely great.

I beseech you to take interest in these sacred domains so expressively called laboratories. Ask that there be more and that they be adorned for these are the temples of the future, wealth and well-being.

A man of science should have no wishes, no affections—a mere heart of stone.

The human spirit, driven by an invincible force, will never cease to ask: What is beyond?

I am a partisan of the truth, no matter who tells it.

The day will come when each of us will be astonished that humanity took so long to rid itself of such a scourge.

I am convinced that the word 'impossible' is not French.

The method is born from the results.

To him who devotes his life to science, nothing can give more happiness than increasing the number of discoveries, but his cup of joy is full when the results of his studies immediately find practical applications.

I have the religion of my laboratory.

The life of a scientist is a continual struggle against the unknown.

I have absolute faith in the power of science to bring about the progress of humanity.

The art of observation and the art of experimentation are one and the same.

It is characteristic of Science and Progress that they continually open new fields to our vision.

I have always believed that science is a great liberator.

The true man of science is he who is always ready to give up his own cherished ideas for the truth.