It becomes an earthly reality as the Holy Spirit guides the Church in rightly praying, celebrating the Eucharist,
guarding church tradition, and uniting believers in love and service.
In the fourth century Athanasius sums up this process in these words: «The actual original
tradition, teaching, and faith of the Catholic
church, which the Lord conferred, the apostles proclaimed, and the Fathers
guarded» (Ad Seraph.