Louis Pasteur

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

It is characteristic of science and progress that they are never stationary.

I am pursuing my researches with the same ardor as ever.

Do not fear the difficulties of life. They do not exist to make you despair, but to make you discover your true self.

The true method of discovery is like the flight of an aeroplane. It starts from the ground of common observation, but it rises into the air of generalization.

The scientist has a duty to be a man of action, and to apply his discoveries to the good of humanity.

The more I study, the more I am convinced that there is no such thing as chance.

The greatest reward for a man's toil is not what he gets for it, but what he becomes by it.

I have been for a long time convinced that the disease of silkworms is due to a living organism.

The germ theory of disease is a luminous conception.

My only strength is my tenacity.

The scientist in his laboratory is not merely a technician; he is also a child, standing before natural phenomena that impress him like a fairy tale.

I have always believed that the progress of science and the progress of humanity are inseparable.

The true character of a man is not seen in the front of the stage, but behind the scenes.

One does not ask of a man who is suffering, 'What is your country?' but 'What is your pain?'

Observation, reason, experiment—these are the three great means of knowledge.

The greatest discovery of all is to know that we are all connected.

I am convinced that the future of medicine is in the hands of the bacteriologist.

The scientist must be a man of faith, a man of hope, and a man of charity.

The more I study nature, the more I am amazed at the work of the Creator.