23. Again, the illustration of the Light and the Radiance has this meaning. For the Saints have not said that the Word was related to God as fire kindled from the heat of the sun, which is commonly put out again, for this is an external work and a creature of its author, but they all preach of Him as Radiance, thereby to signify His being from the essence, proper and indivisible, and His oneness with the Father. This also will secure His true unchangableness and immutability; for how can these be His, unless He be proper Offspring of the Father’s essence? for this too must be taken to confirm His identity with His own Father. Our explanation then having so religious an aspect, Christ’s enemies should not be startled at the ‘One in essence,’ either, since this term also has a sound sense and good reasons. Indeed, if we say that the Word is from the essence of God (for after what has been said this must be a phrase admitted by them), what does this mean but the truth and eternity of the essence from which He is begotten? for it is not different in kind, lest it be combined with the essence of God as something foreign and unlike it. Nor is He like only outwardly, lest He seem in some respect or wholly to be other in essence, as brass shines like gold and silver like tin. For these are foreign and of other nature, are separated off from each other in nature and virtues, nor is brass proper to gold, nor is the pigeon born from the dove; but though they are considered like, yet they differ in essence. If then it be thus with the Son, let Him be a creature as we are, and not One in essence; but if the Son is Word, Wisdom, Image of the Father, Radiance, He must in all reason be One in essence. For unless it be proved that He is not from God, but an instrument different in nature and different in essence, surely the Council was sound in its doctrine and correct in its decree.