Isaac Newton originally published Philosophiæ Naturalis Principia Mathematica, or the Principia, in 1687. It described the law of gravity and the three laws of motion—the foundation of classical mechanics—which students still learn in introductory physics courses today. Newton was also deeply interested in theology and the Bible. He reflected on these subjects in the “General Scholium” of the Principia, which was added to subsequent editions beginning in 1713. Drawing from verses such as Deuteronomy 10:14, Newton believed “this most beautiful System of the Sun, Planets, and Comets, could only proceed from the counsel and dominion of an intelligent and powerful being.” This is a copy of the third edition of Newton’s_ Principia_, the last edition to appear in his lifetime and the basis for those that followed his death in 1727.