of reformers, production of large-scale religious art virtually ceased in Protestant regions after about 1540, and artists shifted to secular subjects, ironically often including revived classical mythology. The earliest catechisms of Reformed (Calvinist) Christianity, written in the 16th through 18th centuries, including the Heidelberg (1563), Westminster (1647) and Fisher's (1765), included discussions in a question and answer format detailing how the creation of images of God (including Jesus) was counter to their understanding of the Second Commandment's prohibition against creating images of worship in any manner. 20th century Calvinist theologian J. I. Packer, in Chapter 4 of his book Knowing God, writes that, "Imagining God in our heads can be just as real a breach of the second commandment as imagining Him by the work of our hands." His overall concern is that "The mind that takes up with images is a mind that has not yet learned to love and attend to God's Word." In other words, image making relies on human sources rather than on divine revelation. Another typical Christian argument for this position might be that God was incarnate as a human being, not as an object of wood, stone or canvas, and therefore the only God-directed service of images permitted is the service of other people. During the period of Archbishop William Laud's conflicts with Puritans within the Church of England, the use of ritual implements prescribed by the Book of Common Prayer was a frequent cause of conflict. (See vestments controversy) Non-use by Amish The Amish are an Anabaptist Christian group that forbids the use of images in secular life. In their critiques these groups argue that such practices are in effect little different from idolatry, and that they localize and particularize God, who, they argue, is beyond human depiction. Differentiation from idolatry in the Catholic Church The Catholic Church states that idolatry is consistently prohibited in the Hebrew Bible, including as one of the Ten Commandments () and in the New Testament (for example , most significantly in the Apostolic Decree recorded in ). There is a great deal of controversy over the question of what constitutes idolatry and this has bearing on the visual arts and the use of icons and symbols in worship, and other matters. As in other Abrahamic religions the meaning of the term has been extended very widely by theologians. The Catechism of the Catholic Church states: "Idolatry not