Entry 0021: Article in PDF format
Orestes J. Gonzalez, “Science, Actus Essendi, and Revealed Truth: Remarks on Methodology,” Actus Essendi Electronic Journal.
Pope John Paul II explicitly identified some fundamental aspects of the 'philosophy of being' as reference point for the different philosophical schools.
A most authoritative statement in this regard is recorded in his encyclical letter Fides et Ratio when he says that "The 'philosophy of being' is strong and enduring because it is based upon the very 'act of being itself' (ipse actus essendi) which allows a full and comprehensive openness to reality as a whole." 
Earlier the Pope had explained that "The basis and source of this openness lie in the fact that the philosophy of Saint Thomas Aquinas (1225-1274) is a 'philosophy of being,' that is, of the 'act of being' (actus essendi); it is the philosophy of the proclamation of being." 
↑ Pope John Paul II, Encyclical Letter Fides et Ratio, 14 September 1998, Acta Apostolicae Sedis, 1999, vol. 91, pp. 5-88, no. 97.
↑ John Paul II, "Address at the Angelicum, The Pontifical University of Saint Thomas Aquinas in Rome," 17 November 1979. The original, in Italian, was published in Acta Apostolicae Sedis, 1979, vol. 71, pp. 1472-1483. English translations are available in Angelicum, 1980, vol. 57, pp. 133-146; and in L'Osservatore Romano English Weekly Edition, December 17, 1979, pp. 6-8.