On the Mass
All wirschipping, honoring, or service inventit by the braine of man in the religioun of God, without his own express commandment, is Idolatrie: The Masse is inventit be the braine of man, without any commandement of God: Thairfoir it is Idolatrie.
John Knox, The Works of John Knox, ed. David Laing, vol. 3 (Edinburgh: Wodrow Society, 1895), 34