Santayana and verifigationism

Santayana's later philosophical writings contain a critique of pragmatism and idealism which still has a little appreciated relevance as a critique of verificationist styles of thought which remain markedly influential. He urged that cognitive thought essentially consists in positing objects the existence of which cannot be verified except by other thoughts which likewise do no more than posit objects, and moreover that in a sense all such posited objects are substances lurking behind their various appearances. Granted that this is a general truth about the objects of thought, one can never discredit the claim to know about objects of any particular type on the grounds that this truth applies to them, nor can it be thought a recommendation of some reductivist account of objects of a certain sort that it saves their existence from being unverifiable, for it will still leave the objects to which they are reduced in the same boat. The continuing relevance of Santayana's insight here is argued for.