13 If we would define and describe this true Church of Jesus Christ - which is the One, Holy, Catholic, Apostolic and Roman Church - we shall find nothing more noble, more sublime, or more divine than the expression "the Mystical Body of Christ" - an expression which springs from and is, as it were, the fair flowering of the repeated teaching of the Sacred Scriptures and the Holy Fathers.
Source: Mystici Corporis Christi (Vatican.va)