Augustine of Hippo : Since Scripture called heaven the firmament, we can without absurdity hold that anything below the ethereal heaven, in which everything is peaceful and stable, is more mutable and perishable and is a kind of corporeal matter prior to the reception of beauty and the distinction of forms. — ON THE LITERAL INTERPRETATION OF Genesis 8.29 Ephrem the Syrian : Although God said about the light that came to be on the first day that "it was very good," He did not say this about the firmament which came to be on the second day, because the firmament had not yet been finished, neither in its structure nor in its adornment. The Creator delayed until the lights came to be so that when [ the firmament ] was adorned with the sun and the moon and the stars, and the strength of the darkness that was weakened by the lights shining from it, He would then say of the firmament as well as of [ the rest of creation ] that "it was very good."