To what does Christ compare the Church? To a city on the top of a mountain, visible to all the eyes in the world. What do you conclude from these words (Matthew 28:17:) "If he will not hear them, tell the Church?" That the Church must have been always visible, otherwise there must have been a time during which this command of Christ was impossible on account of the invisibility of the Church; for no one could lay his complaint before an invisible Church. Hence the Catholic is the true Church, since she is the only Church that has been always visible.
Sacred Scripture Affirms Why A Visible Church On Earth Is Necessary
Pius XII, in the Encyclical “Mystici Corporis,’’ confirmed the teaching of Leo XIII, and expressly rejected the view that the Church is “a mere spiritual entity, joining together by an invisible link a number of communities of Christians, in spite of their difference in Faith.” The visibility of the Church was denied by the Spiritualistic Sects of the Middle Ages, by Huss and the Reformers. According to Huss, the Church consists of the communion of the predestinated. Calvin held the same view. Luther taught that the Church is “the assembly of the saints (the faithful), in which the Gospel is properly taught and the Sacraments are properly administered.
But without an authoritative teaching office there is no certain norm for the purity of doctrine or for the administration of the Sacraments. The rejection of the hierarchy inevitably led to the doctrine of the invisible Church. The biblical proof of the visibility of the Church springs from the Divine institution or the hierarchy. The teaching office demands from its incumbents the duty of obedience to the faith (Romans 1:5) and the confession of faith (Matthew 10:32; Romans 10:10). To the sacerdotal office corresponds, on the part of the faithful, the duty of using the means of grace dispensed by it (John 3:5; 6:54). To the pastoral office corresponds, on the part of those shepherded, the duty of being subject to the Church Authority (Matthew 18:17; Luke 10:16).
St. Irenaeus holds against the Gnostics that the adherents of the Church throughout the whole world confess the same faith, observe the [same commandments and preserve the same form of Church constitution. He compares the Church, which preaches the same truth everywhere, to a seven-branched candlestick, which, visible to all, bears the light of Christ (Adv. haer. V 20, i). St. Augustine compares the Church to a city on a mountain (Matthew 5:14): “The Church stands clear and visible before all men; for she is the city on the mountain which cannot be hidden.
St. Irenaeus holds against the Gnostics that the adherents of the Church throughout the whole world confess the same faith, observe the [same commandments and preserve the same form of Church constitution. He compares the Church, which preaches the same truth everywhere, to a seven-branched candlestick, which, visible to all, bears the light of Christ (Adv. haer. V 20, i). St. Augustine compares the Church to a city on a mountain (Matthew 5:14): “The Church stands clear and visible before all men; for she is the city on the mountain which cannot be hidden.
The work of Redemption consisted in the discharge of this threefold office (of Priest, Prophet, and King). On the eve of His departure from this world Christ delegated His powers to His Apostles: "All power is given to Me in heaven and on earth: going therefore, teach ye all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost, teaching them to observe all things whatsoever I have commanded you: and behold I am with you all days, even to the consummation of the world" (Matthew 28:18-20).
From this commission of Christ, it is evident that His followers form an organized society under the leadership and guidance of the Apostles and their successors, with the right to teach and to command on one side, and the duty to be taught and to obey on the others..
Everything is visible about His great institution: Baptism, which is necessary for membership, the other Sacraments which He commanded His followers to receive, the rulers and lawgivers whom the faithful must obey, the tribunael before which the faithful are judged and to which they have a right to appeal.