The absurdity and perfidy of all authoritative toleration of gross heresy, [electronic resource] : blasphemy, idolatry, popery, in Britain. In two letters to a friend. In which The Doctrine of the Westminster Confession of Faith relative to Toleration of a False Religion, and the power of the Civil Magistrate about Sacred Matters; and the Nature, Origin, Ends and Obligation of the National Covenant and Solemn League are candidly represented and defended. By John Brown, Minister of the Gospel in Haddington.