"Idealism in philosophy is a defence, sometimes extremely elaborate, sometimes less so, of clericalism, of a doctrine that places faith above science, or side by side with science, or in some way or another gives faith a place. Agnosticism (from the Greek words “a” no and “gnosis” knowledge) is vacillation between materialism and idealism, i.e., in practice it is vacillation between materialist science and clericalism."