Summa Theologiae by St Thomas Aquinas
FP: Treatise On The Work Of The Six Days
Q67 On The Work Of Distinction In Itself
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We must consider next the work of distinction in itself. First, the work of the first day; secondly, the work of the second day; thirdly the work of the third day.

Under the first head there are four points of inquiry:

A1 Whether the word light is used in its proper sense in speaking of spiritual things?

A2 Whether light, in corporeal things, is itself corporeal?

A3 Whether light is a quality?

A4 Whether light was fittingly made on the first day?