What would St. Thomas say?
About six day creation? Why, let's ask him:
Hmm. . . and I was told that St. Thomas says we need strict six day creation. I guess the person who told me that was misinformed. . .
I answer that, in discussing questions of this kind two rules are to be observed, as Augustine teaches. The first is, to hold the truth of Scripture without wavering. The second is that since Holy Scripture can be explained in a multiplicity of senses, one should adhere to a particular explanation only in such measure as to be ready to abandon it if it be proved with certainty to be false, lest Holy Scripture be exposed to the ridicule of unbelievers, and obstacles be placed to their believing.
We say, therefore, that the words which speak of the firmament as made on the second day can be understood in two senses. [he goes on to discuss various ideas of the heavens, Plato, Aristotle et al.] If, however, we take these days to denote merely sequence in the natural order, as Augustine holds, and not secession in time, there is then nothing to prevent our saying, whilst holding any one of the opinions given above, that the substantial formation of the firmament belongs to the second day.
Hmm. . . and I was told that St. Thomas says we need strict six day creation. I guess the person who told me that was misinformed. . .