This article discusses the subject of unity in the church. The author includes in the discussion the matters of diversity and pluriformity of the church, the one church and the Word of God, and John Calvin's view of the church.

This article on Article 27 of the Belgic Confession is about the attributes of the church. There is one church, a holy church, a catholic (universal) church, and an apostolic church.

In this article we see Calvin's view of the church: The church is by divine appointment, but not divine; the true church is one, not many; the one church is true, though imperfect; the church is free, in no bondage to no man.