Written by Martin Luther in 1529 in question and answer format, the Small Catechism explores six chief parts of Christian doctrine: the Ten commandments, the Apostles' creed, the Lord's prayer, the sacrament of holy baptism, confession, and the sacrament of the altar. Also included are daily prayers, a table of duties for Christians in their various callings in life, and a guide for Christians to use as they prepare to receive Holy Communion.