"The principle of Church Establishments, properly understood... is just the principle of national religion. It has many ramifications all springing from an acknowledgement of the universal supremacy of Christ, and bearing upon the duty of nations and their rulers to promote the advancement of true religion, and the prosperity of Christ's cause and kingdom. It is connected with the protection of the Sabbath... (it) assumes that nations are moral and responsible creatures, accountable to God in their corporate capacity, and the proper subjects of rewards and punishments. It implies that wherever God's Word exists, its existence and influence ought to be nationally acknowledged as the only supreme authority and the fountain of law... All this is very powerfully expounded and enforced in this volume" (James Begg from the Preface).

In short, this book shows how civil powers are to acknowledge Christ as King, and to civilly sanction all those who publicly promote Satan's kingdom (whether by cries of equality, neutrality, or toleration of lies, deception, heresy or idolatry).