Opus Majus Totally Explained

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The Opus Majus (Latin for "Greater Work") is the most important work of Roger Bacon. It was written in Medieval Latin, at the request of Pope Clement IV, to explain the work that Bacon had undertaken. The 840-page treatise ranges over all aspects of natural science, from grammar and logic to mathematics, physics, and philosophy. Bacon sent his work to the Pope in 1267, accompanied by a letter of dedication which was found by Abbot Gasquet in the Vatican Library and published in 1897. It was followed later the same year by a smaller second work, his Opus Minus, which was intended as an abstract or summary of the longer work, followed shortly by a third work, Opus Tertium, as a preliminary introduction to the other two.
The Opus Majus is divided into seven parts:

Part one considers the obstacles to real wisdom and truth, classifying the causes of error (offendicula) into four categories: following a weak or unreliable authority, custom, the ignorance of others, and concealing one's own ignorance by pretended knowledge.
Part two considers the relationship between philosophy and theology, concluding that theology (and particularly Holy Scripture) is the foundation of all sciences.
Part three contains a study of Bibilical languages: Latin, Greek, Hebrew, and Arabic, as a knowledge of language and grammar is necessary to understand revealed wisdom.
Parts four, five, and six consider, respectively, mathematics, optics, and experimental science. They include a review of alchemy and the manufacture of gunpowder and of the positions and sizes of the celestial bodies, and anticipates later inventions, such as microscopes, telescopes, spectacles, flying machines, hydraulics and steam ships. The study of optics in part five seems to draw on the works of the Arab writers Kindi and Alhazen, including a discussion of the physiology of eyesight, the anatomy of the eye and the brain, and considers light, distance, position, and size, direct vision, reflected vision, and refraction, mirrors and lenses.
Part seven considers moral philosophy and ethics.

An incomplete version of Bacon's Opus Majus was published by William Bowyer in London in 1733. It was edited by Samuel Jebb from a manuscript at Trinity College, Cambridge which omitted the seventh part.
As a recent paper emphasize, this major work can not be usefully read exclusively in the context of the history of science and philosophy while forgetting to consider Bacon's religious commitment to the Franciscan Order. "His Opus maius was a plea for reform addressed to the supreme spiritual head of the Christian faith, written against a background of apocalyptic expectation and informed by the driving concerns of the friars. It was designed to improve training for missionaries and to provide new skills to be employed in the defence of the Christian world against the enmity of non-Christians and of the Antichrist".

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