This Church is not only an assembly of believers, but also the spirit, unanimity, and faith that bind them to one another and to Christ. The house of God is the Church of the God Who lives in it. Therefore God, as living, cares for order in His own society (see P. Polyansky, p. 409). The comparison of the Church to a pillar supporting the roof of a building, and to a stronghold on which the building stands, shows her greatness and unbreakable firmness. It also shows every kind of security, because the truth entrusted to her will remain eternal, as the Church herself remains. "I will build My Church," said Christ, the Head of the Church, "and the gates of Hades shall not prevail against it" (Mt. 16:18). "The immutable guarantee that the Church preserves the truth is that she has the Spirit of God. This Spirit of truth always dwells in the Church and constitutes her vital principle. Because of Him she is always in communion with her Head, Who is also the foundation, besides Whom there can be no other." In general, in verse 15, says the newer interpreter P. Polyansky, the Apostle expresses a view of the Church from three sides. First, from the side of worship, the Church is the house of God. Second, from the side of the regeneration of each person and of all mankind, she is the Church of the living God, Who communicates this life to mankind. Third, from the side of teaching, the Apostle names the Church the pillar and ground of the truth. In this respect the Church is the treasury of truth for all ages and all peoples. Concerning the greatest truth itself, that is, the Incarnation of God, St. John Chrysostom exclaims: "Truly this is a great mystery, because man became God, and God became man. This mystery was hidden even from the Angels, and then revealed not only to them, but also to people of all places and times. Let us therefore live in a manner worthy of this mystery. If a king entrusted some secret to us, would we not consider this a sign of his great favor toward us? Let us tremble that we remain insensible to this benefaction." "The Apostle reminded St. Timothy of this mystery, indicating to him an inexhaustible subject for conversations with the faithful. At the same time, he gave him a powerful weapon for their moral correction, as if saying: reject mercilessly everything inconsistent with this, as falsehood or an admixture of falsehood" (Bishop Theophan).