Turretin (1558-1631) was a Calvinistic scholastic theologian in an age of Protestant, Catholic, Lutheran and Socinian Scholastics. Like his great predecessor, John Calvin, Turretin entitled his scholastic work "Institutio Theologiae Elencticae." The word "Institutio" suggests foundational or basic instruction. Yet, it is a work defined by its depth and preciseness, its theological and philosophical treatises, and its thoroughly biblical expositions. Among Reformed theologians of the world, both present and past, Francis Turretin's "Insitutio" is among the greatest Protestant theological work ever written.