First, joy. "According to Luke, the church's response to rejection and persecution was that 'the disciples were filled with joy and with the Holy Spirit' (Acts 13.52)." Furthermore, throughout the New Testament, the word joy is repeatedly used to describe new life (read Philippians as one example).
Second, unity. Two texts come to mind--John 17 and Acts 4:32-34. The former text depicts Jesus praying for the church, and high on his list is unity. The latter describes what life looks like when the Spirit takes up residence in a community.
Third, resistance. This last sign of the church is the most challenging. " . . . if Jesus is Lord, then resistance was due to any power that would attempt to exercise rival lordship in the life of the believer, either by determining that person's identity or by requiring the believer to do things contrary to the reality of God's reign" (105). He continues to recount the early Christians refusal to be placed in service to the state. Then he states: "This latter point about resisting the powers is central to the apostolic narrative of the birth of the church but is frequently overlooked in the present church's retelling, probably because we do not represent anything like a threat to the status quo (whether that be the state, the military, the market, or civil society. Jesus, as we know, was executed on charges of crimes against both the temple and the state . . ." After reminding us of this sobering truth, Stone reminds us how often the earliest Christians found themselves in trouble for being the church (cf. Acts). The point being, we can't give our souls to Jesus and then surrender our bodies to the state or the market, that is, if Jesus is truly Lord. For if he's Lord, it all belongs to him--our bodies, souls, and minds.
This latter paragraph is very powerful and maybe even troubling to us. Something to think about.