We could not, for example, arrive at a principle like that of entropy without introducing some additional principle, such as randomness, to this topography.

The first thing to make clear is that scientists, freely making their own choice of problems and pursuing them in the light of their own personal judgment, are in fact co-operating as members of a closely knit organization.

Admittedly, the body of scientists, as a whole, does uphold the authority of science over the lay public. It controls thereby also the process by which young men are trained to become members of the scientific profession.

Our reliance on the validity of a scientific conclusion depends ultimately on a judgment of coherence; and as there can exist no strict criterion for coherence, our judgment of it must always remain a qualitative, nonformal, tacit, personal judgment.

But even physics cannot be defined from an atomic topography.

Personal participation is the universal principle of knowing.

We could not, for example, arrive at a principle like that of entropy without introducing some additional principle, such as randomness, to this topography.