Summa Theologiae by St Thomas Aquinas
FP: Treatise On The Most Holy Trinity
Q29 The Divine Persons
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Having premised what have appeared necessary notions concerning the processions and the relations, we must now approach the subject of the persons.

First, we shall consider the persons absolutely, and then comparatively as regards each other. We must consider the persons absolutely first in common; and then singly.

The general consideration of the persons seemingly involves four points: (1) The signification of this word "person"; (2) the number of the persons; (3) what is involved in the number of persons, or is opposed thereto; as diversity, and similitude, and the like; and (4) what belongs to our knowledge of the persons.

Four subjects of inquiry are comprised in the first point:

A1 The definition of "person."

A2 The comparison of person to essence, subsistence, and hypostasis.

A3 Whether the name of person is becoming to God?

A4 What does it signify in Him?