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whether-the-word-‘person’-should-be-said-of-god
cf., Sent.I.D23.Q1.A2, QDePot.Q9.A3
Next, we ask whether that which we defined in A. 1-2 is becoming of God, i.e., is it fitting to attribute this to God, or would it be against reason/dignity.
The reply to this question is simple. Any name can be predicated of God if it denotes some sort of perfection, either in its proper sense if it is a simply simple perfection (i.e., the ratio of the name does not designate limitation, but only the manner in which it exists among creatures) or in an improper/metaphorical sense if it is a mixed perfection (i.e., the ratio of the name designates some sort of limitation).
Now, the ratio of personhood does not designate any imperfection, thus, it can be predicated of God.