Grace does not render the nature it elevates impure

"God is not, within his creation, the rival of [the] person, and his grace does not render the nature it elevates impure."

Ph. Vallin, "Henri de Lubac et Saint Thomas d'Aquin: ouverture et structure en théologie," Revue des sciences religieuses 77, no. 2 (2003): 222. This on de Lubac's opposition to every theology of a "pure nature".