In the doctrine of the Trinity, “person” or “hypostasis” is the term the Church uses “to designate the Father, Son and Holy Spirit in the real distinction among them”. The Church confesses “one God in three persons”, and “each of them is God whole and entire”. The three “are distinct from one another in their relations of origin”. The classic definition, Boethius’s, which Aquinas defends, is “an individual substance of a rational nature”. Of the human being the Catechism says that each “possesses the dignity of a person, who is not just something, but someone”.
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