Quote by Louis Pasteur (1822-1895)

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

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

• 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.

• Chance favors the prepared mind.

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