Cosmas Indicopleustes

God said, Let there be light, and the nature of fire came into being. And again proceeding He says: But our souls He fenced round with the body, while He made the angels bodiless. So then, what we see to be the case with respect to human souls and to angels, the same is the case with respect to fire, for the fire above subsists without matter, but the fire below with matter, for the fire above is akin to the fire below, just as our souls are also akin to the angels. How so? because the former are spirit and the latter too are spirit.