Man can learn nothing unless he proceeds from the known to the unknown.

- Claude Bernard

Those who do not know the torment of the unknown cannot have the joy of discovery.

- Claude Bernard

When we meet a fact which contradicts a prevailing theory, we must accept the fact and abandon the theory, even when the theory is supported by great…

- Claude Bernard

Tout est poison, rien n'est poison, tout est une question de dose. Everything is poisonous, nothing is poisonous, it is all a matter of dose.

- Claude Bernard

Particular facts are never scientific; only generalization can establish science.

- Claude Bernard

All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.

- Claude Bernard

Feeling alone guides the mind.

- Claude Bernard

The experimenter who does not know what he is looking for will not understand what he finds.

- Claude Bernard

We achieve more than we know. We know more than we understand. We understand more than we can explain.

- Claude Bernard