Gentile placed himself within the Hegelian tradition, but also sought to distance himself from those views he considered erroneous. He criticized Hegel's dialectic (of Idea-Nature-Spirit), and instead proposed that everything is Spirit, with the dialectic residing in the "pure act" of thinking. Gentile believed Marx's conception of the dialectic to be the fundamental flaw of his application to system making. To the neo-Hegelian Gentile, Marx had made the dialectic into an external object, and therefore had abstracted it by making it part of a material process of historical development. The dialectic to Gentile could only be something of human precepts, something that is an active part of human thinking. It was, to Gentile, concrete subject and not abstract object. This Gentile expounded by how humans think in forms wherein one side of a dual opposite could not be thought of without its complement.