H. P. Grice at the BBC: "Problems of metaphysics," Third Programme.

“The complexities introduced by the possibility that there is no original, un-constructed, realm of reality, together with a memory of the delicacy of treatment called for by the last of the objections to my view on the philosophy of language, suggest that debates about the foundations of metaphysical theory are likely to be peppered with allegations of a vicious circle; and I suspect that this would be the view of any thoughtful student of metaphysical theory who gives serious attention to the methodology of his discipline.”