This litany includes quotes from the Belgic Confession and the Heidelberg Catechism. Both documents are ecumenically Reformed. The Belgic Confession was written primarily by Guido de Brès in 1561. He was martyred in 1567. The Heidelberg Catechism was prepared by Zacharius Ursinus and Caspar Olevianus, and was approved by the Synod of Dort (1618-1619). While written in the sixteenth century, these documents are useful today for their summary of biblical teachings.