10 A vivid and lively self-awareness on the part of the Church inevitably leads to a comparison between the ideal image of the Church as Christ envisaged it, His holy and spotless bride, (4) and the actual image which the Church presents to the world today. This actual image does indeed, thank God, truly bear those characteristics impressed on it by its divine Founder; and in the course of the centuries the Holy Spirit has accentuated and enhanced these traits so as to make the Church conform more and more to the original intention of its Founder and to the particular genius of human society which it is continually striving to win over to itself through the preaching of the gospel of salvation. But the actual image of the Church will never attain to such a degree of perfection, beauty, holiness and splendor that it can be said to correspond perfectly with the original conception in the mind of Him who fashioned it.
Source: Ecclesiam Suam (Vatican.va)