34 I believe in the Holy Spirit, the holy Christian Church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting. Amen.
35 I cannot connect this article (as I have said) to anything better than Sanctification. Through this article the Holy Spirit, with His office, is declared and shown: He makes people holy [1 Corinthians 6:11]. Therefore, we must take our stand upon the term Holy Spirit, because it is so precise and complete that we cannot find another. 36 For there are many kinds of spirits mentioned in the Holy Scriptures, such as the spirit of man [1 Corinthians 2:11], heavenly spirits [Hebrews 12:23], and evil spirits [Luke 7:21]. But God’s Spirit alone is called the Holy Spirit, that is, He who has sanctified and still sanctifies us. For just as the Father is called “Creator” and the Son is called “Redeemer,” so the Holy Spirit, from His work, must be called “Sanctifier,” or “One who makes holy.”
37 “But how is such sanctifying done?”
Answer, “The Son receives dominion, by which He wins us, through His birth, death, resurrection, and so on. In a similar way, the Holy Spirit causes our sanctification by the following: the communion of saints or the Christian Church, the forgiveness of sins, the resurrection of the body, and the life everlasting. That means He leads us first into His holy congregation and places us in the bosom of the Church. Through the Church He preaches to us and brings us to Christ.”
Luther’s Large Catechism: 3rd Article of the Creed
Concordia: The Lutheran Confessions. 2005 (P. T. McCain, Ed.) (403). St. Louis, MO: Concordia Publishing House.