The Reformers also provided orthodoxy with fundamental insights into the character and arrangement of theology — namely, the locus method, the notion of a historical series of topics in theology and the sense of a Pauline “order” of movement from the problem of sin to the topics of law, grace, the two testaments, predestination, and the church, this latter model being generally compatible with catechetical patterns and with the historical series running from creation to the eschaton (Richard A. Muller, Post-Reformation Reformed Dogmatics, 1:59).