Although God “dwells in unapproachable light,”8 He speaks to man he means of the whole of the universe: “ever since the creation of the world his invisible nature, namely, his eternal power and deity, has been clearly perceived in the things that have been made.”9 This indirect and imperfect knowledge, achieved by the intellect seeking God by means of creatures through the visible world, falls short of “vision of the Father.” “No one has ever seen God,” writes St. John, in order to stress the truth that “the only Son, who is in the bosom of the Father, he has made him known.”10 This “making known” reveals God in the most profound mystery of His being, one and three, surrounded by “unapproachable light.”11 Nevertheless, through this “making known” by Christ we know God above all in His relationship of love for man: in His “philanthropy.”12 It is precisely here that “His invisible nature” becomes in a special way “visible,” incomparably more visible than through all the other “things that have been made”: it becomes visible in Christ and through Christ, through His actions and His words, and finally through His death on the cross and His resurrection.
In this way, in Christ and through Christ, God also becomes especially visible in His mercy; that is to say, there is emphasized that attribute of the divinity which the Old Testament, using various concepts and terms, already defined as “mercy.” Christ confers on the whole of the Old Testament tradition about God’s mercy a definitive meaning. Not only does He speak of it and explain it by the use of comparisons and parables, but above all He Himself makes it incarnate and personifies it. He Himself, in a certain sense, is mercy. To the person who sees it in Him – and finds it in Him – God becomes “visible” in a particular way as the Father who is rich in mercy.~Pope John Paul II
25 Lest you be wise in your own conceits, I want you to understand this mystery, brethren: a hardening has come upon part of Israel, until the full number of the Gentiles come in, 26 and so all Israel will be saved; as it is written, “The Deliverer will come from Zion, he will banish ungodliness from Jacob”; 27 “and this will be my covenant with them when I take away their sins.” 28 As regards the gospel they are enemies of God, for your sake; but as regards election they are beloved for the sake of their forefathers. 29 For the gifts and the call of God are irrevocable. 30 Just as you were once disobedient to God but now have received mercy because of their disobedience, 31 so they have now been disobedient in order that by the mercy shown to you they also may receive mercy. 32 For God has consigned all men to disobedience, that he may have mercy upon all.
33 O the depth of the riches and wisdom and knowledge of God! How unsearchable are his judgments and how inscrutable his ways! 34 “For who has known the mind of the Lord, or who has been his counselor?” 35 “Or who has given a gift to him that he might be repaid?” 36 For from him and through him and to him are all things. To him be glory for ever. Amen ~Rom. 11:25-36