Rudolf Carnap

The 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.

Let us be cautious in making assertions and critical in examining them, but tolerant in permitting linguistic forms.[Carnap__ famous plea for tolerance to which W.V. Quine took exception.]

Logic is the last scientific ingredient of Philosophy; its extraction leaves behind only a confusion of non-scientific, pseudo problems.

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.