Louis Pasteur

It is by doubting that we come to investigate, and by investigating that we recognize the truth.

The microbe is nothing; the terrain is everything.

I am a believer in evolution, but not in the Darwinian sense.

Pasteurization is the death of the microbe.

The vital force is not a myth, but a reality.

In the discovery of truth, method is everything.

The soul is the captain of the body.

Genius is patience.

The best is the enemy of the good.

One must not confuse the method with the result.

Nature is a mutable cloud which is always and never the same.

The heart forgets its sorrow when the mouth is full of bread.

Courage is resistance to fear, mastery of fear - not absence of fear.

It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.

The greatest aberration of the human mind has been the belief in spontaneous generation.

The role of the infinitely small is infinitely great.

I am utterly convinced that there is a principle of life in the universe, and that this principle is not a mechanical one.

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

When I approach a child, I experience two sentiments: tenderness for what he is, and respect for what he may become.

Science advances one funeral at a time.