This faith, which we have received from the Church, which we preserve carefully, because, through the action of the Spirit of God, like a deposit of great price enclosed in a pure vessel, it rejuvenates ceaselessly, and makes the vessel that contains it to be rejuvenated. It is to the Church herself that the gift of God has been imparted, as the breath had been to the created man, so that all the members may partake of it and be vivified thereby; it is in her that the communion with Christ, that is, the Holy Spirit has been deposited, the Earnest-money of incorruption, a confirmation of our faith, and the ladder of our ascent to God […]. For where the Church is, there is also the Spirit of God and where the Spirit of God is, there is the Church and all grace. And the Spirit is Truth.

Saint Irenaeus of Lyons, Adv. Haereses, III, 24, 1, quoted in Boris Bobrinskoy, The Mystery of the Trinity: Trinitarian Experience and Vision in the Biblical and Patristic Tradition (Crestwood, N.Y.: St Vladimir’s Seminary Press, 1999) 199.