We Are in Christ unto New Jerusalem
In John 14 the Lord Jesus speaks about our abiding in God. Verses 19 and 20 say, “Yet a little while and the world beholds Me no longer, but you behold Me; because I live, you also shall live. In that 
day you will know that I am in My Father, and you in Me, and I in you.”
The “little while” after which the world no longer beholds Him points to His death and resurrection. In resurrection the disciples beheld Him and they lived because of Him.
A strong example of their living is Peter; before the Lord’s death his speaking was often foolish, but after the Lord became life to him his speaking in Acts 1–4 was very clear and powerful.
Following the Lord’s death and resurrection we are in Him and He is in us. This is a spiritual reality! Do not question it by looking at the physical realm. In the epistles there are almost 90 verses that speak of our being “in Christ” or “in Christ Jesus.” Other verses speak of our being in the Spirit.
Ephesians 2:21 tells us that in Christ Jesus, “all the building, being fitted together, is growing into a holy temple in the Lord.” New Jerusalem, as the consummation of this, cannot be any less; the city is a living building in Christ our Lord.
Our being in Christ is eternal. First Peter 2:5 says, “You yourselves also, as living stones, are being built up as a spiritual house.” This building is “in Christ Jesus” (Eph. 2:20-22). The consummation of this building work is New Jerusalem.
