The basis of faith for the Church of Scotland is the "Word of God", which it views as being "contained in the Scriptures of the Old and New Testament". Its principal subordinate standard is "The Westminster Confession of Faith" (1647), although here liberty of opinion is granted on those matters "which do not enter into the substance of the faith" (Art. 2 and 5). (The 19th century Scottish distinction was between 'evangelicals' and 'moderates'.) There is no official document in which substantial matters and insubstantial ones are clearly demarcated.