Louis Pasteur

Let me tell you the secret that has led me to my goal. My strength lies solely in my tenacity.

Where observation is concerned, chance favors only the prepared mind.

There are no such things as applied sciences, only applications of science.

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

Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of inventions.

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world. Science is the highest personification of the nation because that nation will remain the first which carries the furthest the works of thought and intelligence.

Chance favors the prepared mind.