Epoché ( epokhe, "suspension") is an ancient Greek term which, in its philosophical usage, describes the theoretical moment where all judgments about the existence of the external world, and consequently all action in the world, are suspended. One's own consciousness is subject to immanent critique so that when such belief is recovered, it will have a firmer grounding in consciousness. This concept was developed by the Greek skeptics and plays an implicit role in skeptical thought, as in René Descartes' epistemic principle of methodic doubt. The term was popularized in philosophy by Edmund Husserl. Husserl elaborates the notion of 'phenomenological epoché' or 'bracketing' in Ideas I. Through the systematic procedure of 'phenomenological reduction', one is thought to be able to suspend judgment regarding the general or naive philosophical belief in the existence of the external world, and thus examine phenomena as they are originally given to consciousness.