Petrus van Mastricht (1630–1706) wrote one of the most important, most mature theological works the period of high orthodoxy (which has nothing to do with the new pot laws in Colorado and Washington State), the Theoretico-Practica Theologia. Todd Rester, who translated and wrote the introduction for William Ames, A Sketch of the Christian’s Catechism has written a terrific introduction to Van Mastricht and the publisher, Reformation Heritage Books, has made it available online freely, along with a section of their forthcoming translation of theTheoretico-Practica Theology on preaching (HT: Brian Lund)