Summa Theologiae by St. Thomas Aquinas
FP: Treatise On The Work Of The Six Days
Q[67] On The Work Of Distinction In Itself
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Prologue   A[1]   A[2]   A[3]   A[4]  

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:

A[1] Whether the word light is used in its proper sense in speaking of spiritual things?

A[2] Whether light, in corporeal things, is itself corporeal?

A[3] Whether light is a quality?

A[4] Whether light was fittingly made on the first day?