In his book "Science, Faith and Society" (1946), Polanyi set out his opposition to a positivist account of science, noting that it ignores the role personal commitments play in the practice of science. Polanyi gave the Gifford Lectures in 1951–52 at Aberdeen, and a revised version of his lectures were later published as "Personal Knowledge" (1958). In this book Polanyi claims that all knowledge claims (including those that derive from rules) rely on personal judgements. He denies that a scientific method can yield truth mechanically. All knowing, no matter how formalised, relies upon commitments. Polanyi argued that the assumptions that underlie critical philosophy are not only false, they undermine the commitments that motivate our highest achievements. He advocates a fiduciary post-critical approach, in which we recognise that we believe more than we can prove, and know more than we can say. The literary critic Rita Felski has named Polanyi as an important precursor to the project of postcritique within literary studies.