Amsterdam: printed by Heinricum Wetstenium, 1684. Vellum. 4to (8.1", 20.6 cm). , 598, 40,  pp. Complete.
First edition: The preeminent Swiss theologian of his time (not the 20th-century philosopher), Heidegger (1633-1698) was a professor of Hebrew, philosophy, dogmatics and ecclesiastical history, moral philosophy and theology. This is a chief example of his influential writings, which were largely leveled against the Roman Catholic Church; though not antagonistic, all his works were on the list of forbidden books. The Protestant Reformation sought to end church injustices and hierarchies and sought secular religion, priests relieved of celibacy, and dismissed opulence. Post-reformation, Heidegger sought to unify the Swiss Reformed churches, still organized as separate entities. Also, the Age of Enlightenment of the 17th century, characterized by the scientific revolution, philosophers widely circulating their ideas, printed books and pamphlets, served to undermine the authority of the monarchy and the church.
Period vellum binding, author and title neatly written at top of spine. All edges speckled red. Red and black text to title page. Decorated capitals and endpieces. Francesco Guicciardini, editor.
Encyclopaedia Britannica XIII, p.209. British Library online. CERL online. Heritage Auctions catalogue of 2015. Catalogue of the Library of the Late William R. Williams, STD, LLD. of 1896, Part II, Item no. 686. Rear pastedown with bookplate of Rev. William Robert Williams, noted for his library of church history and theology, a collection remarkable for its breadth and historic provenance. Vellum binding lightly soiled and slightly sprung, ex-library with Newton Theological Institution subtly labeled on spine and blind-stamped to upper-right corner of title-page, p.3, p.301 and p.597, two adjacent pages mildly toned midway, minimal pale foxing, handful corner creases, small William R. Williams to top edge of title page. Excellent, tight, clean copy. Very good+. Item #880