The definition of the Trinity that I operate from is stated below ...
The doctrine of the Trinity means that there is one God who eternally exists as three distinct Persons — the Father, Son, and Holy Spirit. Stated differently, God is one in essence and three in person. These definitions express three crucial truths: (1) the Father, Son, and Holy Spirit are distinct Persons, (2) each Person is fully God, (3) there is only one God.
The Father, Son, and Holy Spirit are distinct Persons. The Bible speaks of the Father as God (
Philippians 1:2), Jesus as God (
Titus 2:13), and the Holy Spirit as God (
Acts 5:3–4). Are these just three different ways of looking at God, or simply ways of referring to three different roles that God plays? The answer must be no, because the Bible also indicates that the Father, Son, and Holy Spirit are distinct Persons.
For example, since the Father sent the Son into the world (
John 3:16), he cannot be the same person as the Son. Likewise, after the Son returned to the Father (
John 16:10), the Father and the Son sent the Holy Spirit into the world (
John 14:26;
Acts 2:33). Therefore, the Holy Spirit must be distinct from the Father and the Son
So ... the Son, for example, is fully God (i.e. He has all of the qualities necessary for Godhood, ... but He is not the WHOLE of God), as there are (2) other Persons required to complete the WHOLE Godhead (i.e. family).
In the same way, I possess ALL of the qualities necessary to identify as "Harris", ... but I am not the WHOLE of Harris, ... as there are other persons who complete the whole Harris family.