75 That perfection and consummation of unity which We most earnestly beg God to grant to all the Church's sons, can be achieved only through charity. For charity is "the bond of perfection." (67) It is charity alone that makes it possible for us to love God above all else, and makes us ready and glad to do all the good we can to others in a spirit of generosity. It is charity alone which makes "the temple of the living God", (68) the holy Church, and all her sons throughout the world, radiant with supernatural beauty.
Source: Aeterna Dei Sapientia (Vatican.va)