Translated by Frederick Crombie.
Chapter I.--On God.
1. I know that some will attempt to say that, even according to the declarations of our own Scriptures, God is a body, because in the writings of Moses they find it said, that "our God is a consuming fire;"  and in the Gospel according to John, that "God is a Spirit, and they who worship Him must worship Him in spirit and in truth."  Fire and spirit, according to them, are to be regarded as nothing else than a body. Now, I should like to ask these persons what they have to say respecting that passage where it is declared that God is light; as John writes in his Epistle, "God is light, and in Him there is no darkness at all."  Truly He is that light which illuminates the whole understanding of those who are capable of receiving truth, as is said in the thirty-sixth Psalm, "In Thy light we shall see light."  For what other light of God can be named, "in which any one sees light," save an influence of God, by which a man, being enlightened, either thoroughly sees the truth of all things, or comes to know God Himself, who is called the truth? Such is the meaning of the expression, "In Thy light we shall see light;" i.e., in Thy word and wisdom which is Thy Son, in Himself we shall see Thee the Father. Because He is called light, shall He be supposed to have any resemblance to the light of the sun? Or how should there be the slightest ground for imagining, that from that corporeal light any one could derive the cause of knowledge, and come to the understanding of the truth?
 Deut. iv. 24.
 John iv. 24.
 1 John i. 5.
 Ps. xxxvi. 9.
Reference address : https://www.ellopos.net/elpenor/greek-texts/fathers/origen/principia.asp?pg=8