Since Origen and Chrysostom, John's Gospel has been valued as the most spiritual among the New Testament writings. Although Origen recognizes the Stoic character of John's statement that 'God is pneuma' (4:24), an examination of the gospel in light of Stoic physics has not yet been carried out. Instead the Johannine spirit has been absorbed into the Word and lost its distinct character as physical mediator between the divine and humane spheres. Combining her insight into Stoic physics and ancient physiology, the author situates her thesis in the major discussions of modern Johannine scholarship and demonstrates new solutions to well-known problems.