28 "Grace," in a wide sense, may stand for any of the Creator's gifts to His creature; but in its Christian designation, it means all the supernatural tokens of God's love; God's intervention which raises man to that intimate communion of life with Himself, called by the Gospel "adoption of the children of God." "Behold what manner of charity the Father hath bestowed on us, that we should be called and should be the sons of God" (1 John iii. 1). To discard this gratuitous and free elevation in the name of a so-called German type amounts to repudiating openly a fundamental truth of Christianity. It would be an abuse of our religious vocabulary to place on the same level supernatural grace and natural gifts. Pastors and guardians of the people of God will do well to resist this plunder of sacred things and this confusion of ideas.
Source: Mit Brennender Sorge (Vatican.va)