Theory not only formulates what we know but also tells us what we want to know, that is, the questions to which an answer is needed.

It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory, resulting in a very great theoretical development, are completely trivial from any point of view except their relevance to the structure of a theoretical system.

A gloss is a total system of perception and language.

Special emphasis should be laid on this intimate interrelation of general statements about empirical fact with the logical elements and structure of theoretical systems.

The part an actor played on stage was once written on a separate roll of paper.

Empirical interest will be in the facts so far as they are relevant to the solution of these problems.

Sociology should... be thought of as a science of action-of the ultimate common value element in its relations to the other elements of action.