Book Three — Providence, Chapter 91 — Summa Contra Gentiles
[1] From the things shown above we can gather how human actions may be traced back to higher causes and are not performed fortuitously.
[2] Of course, acts of choice and movements of the will are controlled immediately by God. And human intellectual knowledge is ordered by God through the mediation of the angels. Whereas matters pertinent to bodily things, whether they are internal or external, when they come within the use of man, are governed by God by means of the angels and the celestial bodies.
[3] Now, in general, there is one reason for this. Everything that is multiform, mutable, and capable of defect must be reducible to a source in something that is uniform, immutable, and capable of no defect. But all things that are within our power are found to be multiple, variable, and defectible.
[4] It is clear that our acts of choice have the character of multiplicity, since choices are made of different things, by different people, in different ways. They are also mutable, both because of the instability of the mind, which is not firmly fixed on the ultimate end, and also because of the fluctuating character of the things which provide our circumstantial environment. That they are defectible, of course the sins of men testify. But the divine will is uniform, because by willing one object it wills all else, and it is immutable and without defect, as we showed in Book One. So, the movement of all wills and choices must be traced back to the divine will, and not to any other cause, for God alone is the cause of our acts of will and choice.
[5] Likewise, our understanding has the quality of multiplicity, since we gather, as it were, intelligible truth from many sense objects. It is also mutable, for it advances by discursive movement from one thing to another, proceeding from known things to unknown ones. It is, moreover, defectible, because of the admixture of imagination with sensation, as the errors of mankind show. On the other hand, the cognitive acts of the angels are uniform: for they receive the knowledge of truth from one fount of truth; namely, God. Their cognition is also immutable, because they see directly the pure truth about things by a simple intuition, not by a discursive movement from effects to their causes or the reverse. It is even incapable of defect, since they directly intuit the very natures, or quiddities, of things, and understanding cannot err in regard to such objects, just as sense cannot err in regard to proper sensibles. We, however, make guesses as to the quiddities of things from their accidents and effects. Therefore, our intellectual knowledge must be regulated by means of the angelsknowledge.
[6] Again, in regard to human bodies and the external things that men use, it is obvious that there is in them a multiplicity of admixture and contrariety; and that they are not moved uniformly, since their motions cannot be continuous; and that they are defectible through alteration and corruption. In contrast, the celestial bodies are uniform in the way of simple beings with no contrariety in their constitution. Their motions are also uniform, continuous, and always in the same condition. Nor can there be corruption or alteration in them. Hence, it is necessary for our bodies, and the others which come under our use, to be regulated by means of the motions of the celestial bodies.
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