… since the fall results from the claim of created man to be the ultimate point of reference in existence (to be God), it is, in the final analysis, the state of existence whereby the created world tends to posit its being ultimately with reference to itself and not to an uncreated being, God. Idolatry, i.e. turning created existence into an ultimate point of reference, is the form that the fall takes, but what lies behind it is the fact that man refuses to refer created being to communion with God. In other words, viewed from the point of view of ontology, the fall consists in the refusal to make being dependent on communion, in a rupture between truth and communion.
John D. Zizioulas, Being as Communion. Studies in Personhood and the Church. London, DLT, 1985 (2004) 102.