Athan.’s ordinary illustration is, as here, not from ‘fire,’ but from ‘radiance,’ ἀπαύγασμα, after S. Paul [i.e. Hebrews] and the Author of the Book of Wisdom, meaning by radiance the light which a light diffuses by means of the atmosphere. On the other hand Arius in his letter to Alexander, Epiph. Hær. 69. 7. speaks against the doctrine of Hieracas that the Son was from the Father as a light from a light or as a lamp divided into two, which after all was Arian doctrine. Athanasius refers to fire, Orat. iv. §2 and 10, but still to fire and its radiance. However we find the illustration of fire from fire, Justin. Tryph. 61. Tatian contr. Græc. 5. At this early day the illustration of radiance might have a Sabellian bearing, as that of fire in Athan.’s had an Arian. Hence Justin protests against those who considered the Son as ‘like the sun’s light in the heaven,’ which ‘when it sets, goes away with it,’ whereas it is as ‘fire kindled from fire.’ Tryph. 128. Athenagoras, however, like Athanasius, says ‘as light from fire,’ using also the word ἀπό& 207·ῥοια, effluence: vid. also Orig. Periarch. i. 2. n. 4. Tertull. Ap. 21. Theognostus, quoted infr. §25.