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The Catholic Church is the Church that Jesus Christ established. Thus the Church subsists in the Catholic Church. However, members of other Christian churches and denominations are also in communion with the Catholic Church by virtue of their sacraments. The Orthodox Churches possess fully valid sacraments, and are true particular Churches, whereas Protestant Christians are in communion with the Catholic Church on account of their baptism; still, this communion is impaired. The Church in one, because it is unified in Christ across regions and time periods. The Church is Holy on account of the grace of Christ given to it and the holy sacraments it provides. The Church is Catholic because it contains the fullness of the Apostolic Deposit of Faith, thus is it truly “according to the whole” and “universal.” Finally, the Church is Apostolic because its Teachings and Authority come from the Apostles themselves.