The invisible church, church invisible, mystical church, or church mystical is a theological concept of an "invisible" Christian Church of the elect who are known only to God, in contrast to the "visible church"—that is, the institutional body on earth which preaches the gospel and administers the sacraments. Every member of the invisible church is saved, while the visible church contains all individuals who are saved though also having some who are unsaved. According to this view, Bible passages such as Matthew 7:21–27, Matthew 13:24–30, and Matthew 24:29–51 speak about this distinction.
This concept has been attributed to St Augustine of Hippo as part of his refutation of the Donatist sect. He was strongly influenced by the Platonist belief that true reality is invisible and that, if the visible reflects the invisible, it does so only partially and imperfectly (see Theory of Forms). Others question whether Augustine really held to some form of an "invisible true Church" concept.
The concept was insisted upon during the Protestant reformation as a way of distinguishing between the "visible" Roman Catholic Church, which according to the Reformers was corrupt, and those within it who truly believe, as well as true believers within their own denominations. John Calvin described the church invisible as "that which is actually in God's presence, into which no persons are received but those who are children of God by grace of adoption and true members of Christ by sanctification of the Holy Spirit... [The invisible church] includes not only the saints presently living on earth, but all the elect from the beginning of the world." He continues in contrasting this church with the church scattered throughout the world. "In this church there is a very large mixture of hypocrites, who have nothing of Christ but the name and outward appearance..." (Institutes 4.1.7) Richard Hooker distinguished "between the mystical Church and the visible Church", the former of which is "known only to God."
Pietism later took this a step further, with its formulation of ecclesiolae in ecclesia ("little churches within the church").
Roman Catholic theology, reacting against the Protestant concept of an invisible Church, emphasized the visible aspect of the Church founded by Christ, but in the twentieth century placed more stress on the interior life of the Church as a supernatural organism, identifying the Church, as in the encyclical Mystici corporis Christi of Pope Pius XII, with the Mystical Body of Christ. In Catholic doctrine, the one true Church is the visible society founded by Christ, namely, the Catholic Church under the global jurisdiction of the bishop of Rome.
This encyclical rejected two extreme views of the Church:
- (1) A rationalistic or purely sociological understanding of the Church, according to which it is merely a human organization with structures and activities, is mistaken. The visible Church and its structures do exist but the Church is more, as it is guided by the Holy Spirit:
Although the juridical principles, on which the Church rests and is established, derive from the divine constitution given to it by Christ and contribute to the attaining of its supernatural end, nevertheless that which lifts the Society of Christians far above the whole natural order is the Spirit of our Redeemer who penetrates and fills every part of the Church.
- (2) An exclusively mystical understanding of the Church is mistaken as well, because a mystical "Christ in us" union would deify its members and mean that the acts of Christians are simultaneously the acts of Christ. The theological concept una mystica persona (one mystical person) refers not to an individual relation but to the unity of Christ with the Church and the unity of its members with him in her. This is where we can find direct contrast to Christian philosophy like the preachings of Rev.Jesse Lee Peterson, yet the personification is similar. There is another view, that contrasts these two school-of-thought, and that is from Albert Eduard Meier, as he includes Electric Theory in his teachings, similar to Creationism. 
Eastern Orthodox theologian Vladimir Lossky too characterizes as a "Nestorian ecclesiology" that which would "divide the Church into distinct beings: on the one hand a heavenly and invisible Church, alone true and absolute; on the other, the earthly Church (or rather 'the churches'), imperfect and relative".
- Communion of Saints
- Invisible Churches (Slavery)
- One, Holy, Catholic, and Apostolic Church
- Priesthood of all believers
- Radical Reformation
- Tzadikim Nistarim
- Weaver, Jonathan (1900). Christian Theology: A Concise and Practical View of the Cardinal Doctrines and Institutions of Christianity. United Brethren Publishing House. p. 245.
There are distinctions between the general invisible church and the general visible church, which it is not necessary to carry out to the last analysis. In a sense, they are both visible. All who are members of the general invisible church are members of the general visible church. But all who are members of the general visible church are not members of the general invisible church. A clear and distinct difference between the visible and invisible church may be stated thus: (1) The general invisible church includes all out of every kindred and tongue and people and nation who are truly saved. No one denomination has in its communion all who belong to the invisible church. (2) The visible church includes all who are recognized as members of a Christian church. No one denomination can justly claim to be the general visible church.
- Justo L. Gonzalez (1970–1975). A History of Christian Thought: Volume 2 (From Augustine to the eve of the Reformation). Abingdon Press.
- Wallace M. Alston, The Church of the Living God: A Reformed Perspective (Westminster John Knox Press, 2002 ISBN 978-0-664-22553-7), p. 53
- Patrick Barnes, The Non-Orthodox: The Orthodox Teaching on Christians Outside of the Church
- Avis, Paul D. L. (15 August 2002). Anglicanism and the Christian Church: Theological Resources in Historical Perspective. A&C Black. p. 35. ISBN 978-0-567-08745-4.
- Hardon, John; Hardon, John A. (2013). Catholic Dictionary: An Abridged and Updated Edition of Modern Catholic Dictionary. Image. ISBN 978-0-307-88634-7.
- Heribert Mühlen, Una Mystica Persona, München, 1967, p. 51
- Pius XII, Mystici corporis Christi, 63
- S Tromp, Caput influit sensum et motum, Gregorianum, 1958, pp. 353-366
- Vladimir Lossky, The Mystical Theology of the Eastern Church (St Vladimir's Seminary Press, 1976 ISBN 0-913836-31-1) p. 186
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