1st Thessalonians 4:13 - 5

"What is a church?" Now that seems like a easy question, the sort of question one might answer in an simple sentence or two. "A church is a building in which Christians meet for worship," is one obvious possibility. "A church is a group of Christians who gather for religious purposes" is another. These sentences aren't bad for quick answers, but they don't take us very far if we want to understand truly what a church ought to be.