[Those] who have an excessive faith in their theories or in their ideas are not only poorly disposed to make discoveries, but they also make very poor observations.

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

Hatred is the most clear- sighted, next to genius.

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

A discovery is generally an unforeseen relation not included in theory.

If I had to define life in a single phrase, I should clearly express my thought of throwing into relief one characteristic which, in my opinion, sharply differentiates biological science. I should say: life is creation.

The investigator should have a robust faith - and yet not believe.