Science increases our power in proportion as it lowers our pride.

In these researches I followed the principles of the experimental method that we have established, i.e., that, in presence of a well-noted, new fact which contradicts a theory, instead of keeping the theory and abandoning the fact, I should keep and study the fact, and I hastened to give up the theory.

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

We must keep our freedom of mind, ... and must believe that in nature what is absurd, according to our theories, is not always impossible.

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

The goal of scientific physicians in their own science ... is to reduce the indeterminate. Statistics therefore apply only to cases in which the cause of the facts observed is still indeterminate.

Priestley [said] that each discovery we make shows us many others that should be made.