Obervation is a passive science, experimentation is an active science.

Art is 'I'; science is 'we'.

Obervation is a passive science, experimentation is an active science.

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.

[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.

Our ideas are only intellectual instruments which we use to break into phenomena; we must change them when they have served their purpose, as we change a blunt lancet that we have used long enough.

We must alter theory to adapt it to nature, but not nature to adapt it to theory.‎