1 Clement For it is thus written, "Who maketh His angels spirits, and His ministers a flame of fire."[156] Origen de Principiis Book II Respecting the substance of the angels also it speaks as follows: "Who maketh His angels spirits, and His ministers a burning fire; "[135] Lactantius Divine Institutes Book IV of God, and also that the other angels are spirits[49] For it is thus written, "Who maketh His angels spirits, and His ministers a flame of fire."[197]