Free Will
Man's possession of free will as a distinctive excellence setting him apart from other creatures. The formula "God saw that it was good" was omitted for man to signify that man possesses free will, and his principal goodness (moral goodness) depends on its use. The stars incline but do not necessitate the will; the will, especially aided by grace, dominates both body and passions.
Chapter I (The Six Days of Creation)
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Verse 31: And God Saw All Things That He Had Made, and They Were Very Good
— The fifth reason the formula "God saw that it was good" was omitted for man: to signify that man possesses free will, and his principal goodness depends on its use.
"man, because he is free, has the greater goodness of virtue, or moral goodness. Therefore, to indicate that the moral goodness of man, which is the principal kind, depends on the use of his free will, God did not wish to say of him beforehand that he was good."
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Verse 14: Let There Be Lights in the Firmament
— The stars incline but do not necessitate the will; the will, especially aided by grace, dominates both body and passions; the wise man rules the stars.
"the will, especially when aided by grace, dominates both the body and these passions; whence we see many choleric people who are gentle, and melancholic people who are benign and magnanimous. The wise man therefore will rule the stars."