Au contraire. . .as presented in post #463,
three separate persons in the one Being, God, is doctrine,
the threeness in the oneness,
the three separate persons (as distinct from just three separate functions) in the one God,
the Trinity in the Unity.
For Scripture presents the following relationships among the three separate divine agents:
the Son is subject to the Father, for the Son is sent by the Father in the Father's name (John 5:23,
36, 43),
the Spirit is subject to the Father, for the Spirit is sent by the Father in the Son's name (John 14:26), and
and the Spirit is subject to the Son as well as the Father, for the Spirit is sent by the Son as well as the Father (John 15:26, 16:7, 14:26).
A person doesn't send oneself, a person sends someone else who is a separate person.
Three separate persons in the one Being, God, is doctrine.