How, according to the natural law ethics of Thomas Aquinas, can humans discover what God commands?

I have two great supplementary resources that you may read through to help your understanding:
https://plato.stanford.edu/entries/natural-law-ethics/
https://epublications.marquette.edu/dissertations/AAI9014051/
How, according to the natural law ethics of Thomas Aquinas, can humans discover what God commands?
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