Michael Horton on the church and Christ's kingdom

The church is not simply another voluntary society, like the Boy Scouts or the Sierra Club. It’s an embassy of Christ’s Kingdom….unlike the rulers of this age, Jesus doesn’t ask us to shed our blood for his empire; he instead gave his own life for his realm. Then he was raised in glory as the beginning of the new creation, and now he is gathering coheirs into his kingdom who belong to each other because, together, they belong to him. The visible church is where you will find Christ’s kingdom on earth, and to disregard the kingdom is to disregard the king.
— Michael Horton, Church Membership: How the World Knows Who Represents Jesus by Jonathan Leeman (Foreword, 14-15)