2Corinthians 4 ...
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The chapter continues and closes thusly ...
18 While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
The scriptures distinguish between the outward man and the inward, those who appear as whitewashed sepulchre, those who wash the outside of the cup, the wolf in sheep's clothing, those who have power in this world and those who do for eternity. The scriptures distinguish between a temple building and the temple of the holy spirit, between laws written on stones and those on the heart. It distinguishes between Jacob and Esau, between works of the law and the fruit of the spirit.
These concepts and many more like them, taken together as a systematic theology based on hermeneutics including exegesis form the doctrine of visible and invisible church.
The invisible church manifests on the playground, on a park bench, on the bus, in the grocery store - it knows no bounds and is not shackled to a building or preacher or rites and rituals and outward forms of McReligion and Churchianity.