Is there a structural temple in heaven where Christ serves in some way? St. Paul wrote much of the New Testament but he knows nothing about this. Instead, Paul emphasizes that the bodies of Christians are each a Temple of the Holy Spirit. If there was an actual temple with gates, an altar, courtyards, columns and porticos, and an Ark of the Covenant up there somewhere you think that Paul would mention that as well. We would expect him to say that the Temple of the Holy Spirit concept is not supposed to detract from the temple where Christ actually serves, if this were the case. St. Paul says no such thing, because there is no literal heavenly temple.
Paul makes the point about the Temple of the Holy Spirit in three different passages in Corinthians.
Dont you know that you yourselves are Gods temple and that Gods Spirit lives in you? If anyone destroys Gods temple, God will destroy him; for Gods temple is sacred, and you are that temple.
--1 Corinthians 3:16-17 NIV
Do you not know that your body is the temple of the Holy Spirit, who is in you, whom you have received from God?
--1 Corinthians 6:19 NIV
What agreement is there between the temple of God and idols? For we are the temple of the living God.
2 Corinthians 6:16 NIV
In Ephesians, Paul makes a related point but puts a different spin on it, painting a picture of a symbolic temple. Paul uses this symbolic temple to unite Jew and Gentile, instead of using it to continue Old Testament ritual and Old Testament ideas. Here Christ is the chief cornerstone of Gods household which rises to become a holy temple. Yet Christ does not serve in this temple as a priest or as a sacrifice--instead, He is a part of the building!
Consequently, you are no longer foreigners and aliens, but fellow citizens with Gods people and members of Gods household, built on the foundation of the apostles and prophets, with Christ Jesus himself as the chief cornerstone. In him the whole building is joined together and rises to become a holy temple in the Lord. And in him you too are being built together to become a dwelling in which God lives by his Spirit.
--Ephesians 2:19-22 NIV
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