On Aristotle's on the Soul 2.7 12

by John Philoponus, William Charlton (Translator)

In this, one of the most original ancient texts on sense perception, Philoponus considers how far perceptual processes are incorporeal. In his view, color affects us in the same way as light which, passing through a stained-glass window, affects the air, but colors only the masonry beyond. Sounds and smells are somewhat more physical, traveling most of the way to us with a moving block of air, but not quite all the way. Only the organ of touch takes on the tangible qualities perceived, because reception of sensible qualities in perception is cognitive, not physical. Neither light nor the action of color involves the travel of bodies. Our capacities for psychological activity do not follow, nor result from, the chemistry of our bodies, but merely supervene on that. Philoponus shows knowledge of the sensory nerves and he believes that thought and anger both warm us. This insight is used elsewhere to show how we can tell someone else's state of mind.

240 pages, Hardcover

First published November 1, 2004

About the author

John Philoponus (/fᵻˈlɒpənəs/; Ἰωάννης ὁ Φιλόπονος; c. 490 – c. 570), also known as John the Grammarian or John of Alexandria, was an Alexandrian philologist, Aristotelian commentator and Christian theologian, author of a considerable number of philosophical treatises and theological works.

A rigorous, sometimes polemical writer and an original thinker who was controversial in his own time, John Philoponus broke from the Aristotelian–Neoplatonic tradition, questioning methodology and eventually leading to empiricism in the natural sciences. He was one of the first to propose a "theory of impetus" reminiscent of the modern concept of inertia over Aristotelian dynamics.

Later in life Philoponus turned to Christian apologetics, arguing against the eternity of the world, a theory which formed the basis of pagan attack of the Christian doctrine of Creation. He also wrote on Christology, and was posthumously condemned as a heretic by the Imperial Church in 680–81 because of what was perceived of as a tritheistic interpretation of the Trinity.

His by-name ὁ Φιλόπονος translates as "lover of toil", i.e. "diligent", in reference to a miaphysite confraternity in Alexandria, the philoponoi who were active in debating pagan (i.e. Neoplatonic) philosophers.

His posthumous condemnation limited the spread of his writing, but copies of his work did circulate in Greek or Latin versions in medieval Europe, influencing Bonaventure and Buridan. His work was also received in Arabic scholarly tradition, where he is known as Yaḥyā al-Naḥwī (i.e. "John the Grammarian"). His critique of Aristotle in the Physics commentary was a major influence on Giovanni Pico della Mirandola and Galileo Galilei, who cited Philoponus substantially in his works.