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Gnosiology (from the Greek γνώσης or "gnõsis," "knowledge") is the study of intuitive (spiritual) knowledge. This is in contrast to scientific (empirical) knowledge (in Greek, επιστήμη or "epistẽmẽ") which denotes knowledge of the natural, material world. Epistemological knowledge, as such, is that knowledge of which natural, "fallen" man is capable. Gnosis is knowledge of the divine, spiritual and also of the uncreated that requires an enlightened heart or mind (Greek: "nous").
- Definition of gnosiology by The Very Rev. Prof. George Metallinos of the University of Athens Department of Theology