Trinity

Within the one being that is God there exist eternally three co-equal, co-eternal persons.

Foundations
1. Monotheism - Only one true God
2. Three Divine Persons - Father, Son, Holy Spirit
3. These Three Persons are Co-Equal, Co-Eternal

1. Monotheism - Deut. 6:4, Deut. 4:35, Isaiah 43:10, Isaiah 45:5-6, Isaiah 44:1-8, Psalm 96:5
2. Deity of Christ - John 1:1-3,18, John 17:3-5, Phil 2:5-7, Col. 2:9
3. Jesus is Yahweh - (Psalm 102:25-27, Hebrews 1:6-10) (John 12:39-43, Isaiah 6:10)
4. Relationship of Father, Son, and Holy Spirit - John 14:15-31, John 16:1-15

Who does the whole of Scripture proclaim to be God?
Ephesians 4:6 proclaims the Father to be God.
Titus 2:13; John 1:1,14; 20:28 proclaim the Son to be God.
Acts 5:3-4 proclaims the Holy Spirit to be God.

And of course Deuteronomy 4:35 proclaims God to be the one, true God.

If you take away Monotheism you have Polytheism
If you take away the Three Persons you have Modalism
If you take away the Equality of the Persons you have Subordinationism

Only with all three (Monotheism, Three Persons, Equality of Persons) do you have the Biblical Trinity

The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all. (2 Corinthians 13:14 ESV)

Constructed from my notes on this video by Dr. James White: