And God saw the light, that it was good: and God divided the light from the darkness.
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Basil the Great
Evening, then, is a common boundary line of day and night; and similarly morning is the part of night bordering on day. In order, therefore, to give the prerogative of prior generation to the day, Moses mentioned first the limit of the day and then that of the night, as night followed the day. The condition in the world before the creation of light was not night but darkness. That which was opposed to the day was named night.