An interesting article, "Where is God?Thinking in More Than Three Dimen sions" in God for the 21st Century (Houghton 157-59), may characterize a prin cipal feature of the God whom people in general nowadays are genuinely looking for.Accordingly, people in this postmodern age do not want to be "just imagin ing some remote being but experiencing him [God] for real."(Houghton 159) In other words, countless people at the beginning of the third millennium today are hungry for a God who is not present in an abstract and transcendent way.Rather, Deity should be existing in a really concrete manner with whom they can interact everywhere in their daily lives.In the metaphysical language of St. Thomas Aquinas (1225-74), one may say that the God whom countless people are thirsty for is no longer the abstract Ipsum Esse Subsistens (i.e., Subsisting Exis tence Itself).Rather, they are seeking for, heuristically speaking, Ipsa Essentia Subsistens (i.e., Subsisting Essence Itself), who is personally and substantially con crete everywhere according to His loving, self-giving essence or nature.As we know, Thomistically speaking, God's omnipresent Existence is exactly the same as His omnipresent Essence (Aquinas, "Summa contra Gentiles," XXII).As it is, heuristics (from Greek heuriskein "find") is the study and use of certain trial-and-error technique(s), problem-solving method(s) or rule(s) loosely defined which enable a person to discover and learn something (Soanes and Stevenson 815).Bernard Lonergan (1904-84) states: "A heuristic notion, then, is the notion of an unknown content and it is determined by anticipating the type of act through which the unknown would become known" (Lonergan, Insight 392).In retrospect, St. Thomas did not use the term Ipsa Essentia Subsistens for God.He only implied it.It is the author's trial-and-error name for God to dis cover and learn something about Him anew.Awaiting proper verifications, this name represents an effort to bring the medieval idea of Ipsum Esse Subsistens