Catechism in a Year
Friday, May 25, 2018
161. Why is the Church one?
The Church is one because she has as her source and exemplar the unity of the Trinity of Persons in one God. As her Founder and Head, Jesus Christ re-established the unity of all people in one body. As her soul, the Holy Spirit unites all the faithful in communion with Christ. The Church has but one faith, one sacramental life, one apostolic succession, one common hope, and one and the same charity.
Further reading: CCC 813-815, 866
162. Where does the one Church of Christ subsist?
The one Church of Christ, as a society constituted and organized in the world, subsists in (subsistit in) the Catholic Church, governed by the Successor of Peter and the bishops in communion with him. Only through this Church can one obtain the fullness of the means of salvation since the Lord has entrusted all the blessings of the New Covenant to the apostolic college along whose head is Peter.
Further reading: CCC 816, 870
163. How are non-Catholic Christians to be considered?
In the churches and ecclesial communities which are separated from full communion with the Catholic Church, many elements of sanctification and truth can be found. All of these blessings come from Christ and lead to Catholic unity. Members of these churches and communities are incorporated into Christ by Baptism and so we recognize them as brothers.
Further reading: CCC 817-819, 870
These excerpts are from the Compendium of the CCC.