This piece is a somewhat technical philosophical critique of neo-Thomism as represented by two of its most famous proponents, Bernard Lonergan a Canadian, and Karl Rahner, a German. Both men are deceased; both were Jesuit priests. While I realize that the essay requires familiarity with these authors … and that my treatment does not provide that … I felt that it covers points that are essential to understanding the transition from an essentialist to an empiricist perspective. It contains the central insight of the yet-to-be-published Mystery of Matter which underlies most of my thinking in all these essays: that existence is material energy.