A Study of the Method and Piety in the Theoretico-practica theologia of Petrus van Mastricht (1630-1706) This study, which introduces the life and work of the successor of Gisbertus Voetius, demonstrates the relationship between exegesis, doctrine, elenctic, and praxis in the doctrine of God in van Mastricht’s Theoreticapractica theologia, a work characterized by Jonathan Edwards “as much better than Turretin or any other book in the world, excepting the Bible.” In particular, this book examines the relationship between method and piety in van Mastricht’s systematic theology.