Summary: One good, time-tested definition of the Trinity reads like this: There is one God, eternally existent in three Persons — the Father, the Son, and the Holy Spirit. 1 Corinthians 2:14 The man without the Spirit does not accept the things that come from the
One good, time-tested definition of the Trinity reads like this: There is one God, eternally existent in three Persons — the Father, the Son, and the Holy Spirit.
1 Corinthians 2:14 The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned.
•• The mind alone cannot fathom the deep mystery of the Trinity. It must be “spiritually discerned”.
1 John 5:7, King James Version (KJV) For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
•• “Three are one.” Three divine Persons — the Father, the Word [Jesus], and the Holy Ghost. Yet they are said to be “one”.
• Note: “Holy Ghost” in the King James Version and “Holy Spirit” in most modern translations mean one and the same thing, being translated from the same Greek words.
•• Admittedly, some manuscripts and translations do not agree that the full verse 7 as contained in the King James Version is in the original. We cannot definitively resolve that divided opinion, but we will see that many other verses in the bible clearly indicate that God is indeed a Trinity — one God, eternally existent in three persons, the Father, the Son, and the Holy Spirit. To those Scriptures we will now turn.
1. IS THERE ONE GOD? YES.
Romans 3:30 ...there is only one God...
Mark 12:29, KJV ...Hear, O Israel; The Lord our God is one Lord.
Galatians 3:20 ...God is one.
2. CAN GOD BE PLURAL, EVEN THOUGH HE IS ONE? AGAIN, YES.
Genesis 1:26-27 Then God said, “Let us make man in our image, in our likeness...”  So God created man in his own image...
•• The very word for “God” is plural in the Hebrew of these and many other verses.
•• Note the easy interaction of the plural (“us...our”, vs. 26) and the singular (“his”, vs. 27) in speaking of the same “God”.
Genesis 3:22a And the LORD God said, “The man has now become like one of us, knowing good and evil.”
• Plurality (“us”) again in God’s self-revelation.
Genesis 18:1-2 The LORD appeared to Abraham near the great trees of Mamre while he was sitting at the entrance to his tent in the heat of the day.  Abraham looked up and saw three men standing nearby. When he saw them, he hurried from the entrance of his tent to meet them and bowed low to the ground.
•• In this great theophany, the Lord God appeared to Abraham in the visible form of “three men”.
•• In the rest of this chapter and its dialogue, the “three men” were frequently identified by the divine names “Jehovah” and “Adonay”. Deity was revealed on earth in a theophany of three men.
3. IS THE FATHER GOD? YES.
2 Peter 1:17 For he received honor and glory from God the Father when the voice came to him from the Majestic Glory, saying, “This is my Son, whom I love; with him I am well pleased.”
Ephesians 5:20 ...always giving thanks to God the Father for everything...
4. IS JESUS GOD? YES.
John 20:28 Thomas said to him [the resurrected Jesus], “My Lord and my God!”