I'm sorry, I should have been clearer. Forgive me.
Let me quote a part of a translation of "19 stellingen inzake de kerk" from K. Schilder
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1. That a church exists -- this one cannot see, but only "believe." Every definition of the essence of the church (supposing that it is possible to speak about such an "essence"

using that which one can see in the world here below, or on the grounds of other axioms than the Scripture has "revealed", is thus a work of nonbelief or unbelief -- even if many truths may be expressed. "Discovering" or "inventing" truths is pride in this case as well.
2. "The" church has never been observed. No one has ever seen "the" church. No one has ever seen "humanity." No one has ever seen the Dutch people or any other people. For the church is never "finished," just as little as humanity or a people are "finished." Only when the last elect person will have come to faith and will be carrying on a life of faith will "the" church have reached her pleroma [fullness]. Even then, however, the "seeing" of it, in one and the same way of "seeing," will be possible only on the other side of the boundary that divides this age from the coming one.
3. Strictly speaking, there is thus not yet a "visible" church. There are just temporary and local "parts" and "activities" of such parts of the church to be seen. For example: certain ways of structuring and organization of the life of such parts of the church in a certain period of time (the Old Testament, the New Testament, before and after a reformation) or in a certain place (on earth; in heaven; in the Netherlands, Russia, or Java; and so on).
4. Inasmuch as the concept of "invisible" is determined by the concept "visible," the need to speak about an "invisible church" is eliminated.
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Further reading (links):
Nineteen Thesis Concerning The Church - Prof. Dr. K. Schilder
Christ Church and our calling - Dr. R.D. Anderson
[Edited on 4-10-2004 by Harrie]