"Go, Be the Church".  I heard this once while getting ready to leave church.

Maybe the church building and the church service are types of catalysts to get one to be the church outside of the church - you know, kind of a play ground or test facility to see how one becomes the Church.  Oh, I like that as it insinuates that one doesn't *have* to go to church each week, but hopes that one acts as the Church throughout the week.

[How one acts as the Church is a topic of a different post]