""John Duns Scotus and the Principle Omne Quod Movetur Ab Alio Movetur"" by Roy R. Effler is a scholarly book that explores the philosophical ideas of John Duns Scotus, a medieval philosopher and theologian. The book focuses on Scotus' concept of the principle of causality, which states that everything that is moved is moved by another. This principle is known as Omne Quod Movetur Ab Alio Movetur, and it is a central idea in Scotus' philosophy.Effler's...