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The meaning of the title is: whether the union of the Word incarnate
so took place that in Christ there is one suppositum, only one
hypostasis..
The answer is in the affirmative, and it is of faith. The Council
of Ephesus declares that "the union is subsistential."[593]
But some heretics said that there is one person but two supposita.
St. Thomas refutes this heresy by three arguments.
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1) He points out that, by the addition of the note of person to the
hypostasis, the nature becomes determinate and rational.
2) If it be said that "what person adds to the hypostasis is a
dignity," then the union would be according to a certain dignity, or
it would be a moral union, as Nestorius contended.
3) If there were two supposita in Christ, then to one of these what
pertains to God would be attributed, and to the other what pertains to
man. This would result in the severance of the subsistential
union.[594]
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