"Assemblies that worship God in spirit and in truth are the Israel of God; assemblies that either worship false gods, or the true God in a false manner, are the synagogue of Satan: though they may profess to be the only people of God, their profession is a lie." (Matthew Henry) There is a "church of the living God" and there is a "synagogue of Satan." One is the "pillar and ground of truth" while the other is the "pillar and ground of lies" - pretense, masquerading, and counterfeit. The church has been entrusted with a business - a duty or a privilege - if you will. She is to maintain truth...defend it from assaults of error...and transmit it safe and uncorruptible from generation to generation.