The physicist can never subject an isolated hypothesis to experimental test, but only a whole group of hypotheses.

- Pierre Duhem

The history of science alone can keep the physicist from the mad ambitions of dogmatism as well as the despair of pyrrhonian scepticism.

- Pierre Duhem

If the aim of physical theories is to explain experimental laws, theoretical physics is not an autonomous science; it is subordinate to metaphysics.

- Pierre Duhem

Now these two questions Does there exist a material reality distinct from sensible appearances? and What is the nature of reality? do not have their …

- Pierre Duhem