Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.
Rudolf CarnapIt is indeed a surprising and fortunate fact that nature can be expressed by relatively low-order mathematical functions.
Rudolf CarnapThe self is the class (not the collection) of the experiences (or autopsychological states). The self does not belong to the expression of the basic experience, but is constructed only on a very high level.
Rudolf Carnap