The Trinity

The definition for the term trinity is all throughout the Bible.

This is the idea:
One God co-existing eternally as three persons
1x1x1=1

The Biblical doctrine (teaching) of the Trinity is really a composite of the Biblical doctrine of Monotheism (only one God), and the deity of the Father, the deity of the Son and the deity of the Holy Spirit. Three deity personages that co-exist eternally as only one God (see also my study on monotheism).

The Doctrine of the Trinity and the Deity of Jesus is denied by every false religion. If the one who was sacrificed for the sins of the world was not God in the flesh then His sacrifice is not enough to save us and therefore works are needed BUT all of this contradicts the Bible.
Therefore every false religion denies the Trinity, they deny that salvation is in Jesus alone (they embrace salvation by works), and they say the Bible is insufficient for knowing God's will (you need another book or a special interpretation of the Bible).

It is also important to note that no major doctrine should ever be established on an obscure verse here and there (like baptism of the dead 1 Corinthians 15:29). But major doctrines should be established on what the entirety of scripture teaches.

"And God said, Let us make man in our image, after our likeness...So God created man in his own image, in the image of God created he him; male and female created he them." - Genesis 1: 26-27

"And the LORD God said, Behold, the man is become as one of us, to know good and evil..." - Genesis 3:22

"And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do. Go to, let us go down, and there confound their language, that they may not understand one another's speech." - Genesis 11:6-7

"...The LORD our God is one LORD..." - Deuteronomy 6:4
In Hebrew: "YHWH Elohim YHWH Echad"

*YHWH is the Old Testament Name of God
*Elohim is a plural (im ending) of god and means three or more in unity and is used when referring to YHWH in a singular title. Elohim is used throughout the Old Testament but what is interesting is (like most languages) the verb and the noun have to agree and the way Elohim is used is a plural word speaking in a singular context.
*Echad means united, altogether, one, only, first etc.
The Trinity is implied all throughout this statement.

"And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory." - Isaiah 6:3

"For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, Everlasting Father [Father of eternity the idea speaks of Him being the First and Last, the Alpha and Omega, the Aleph and Tau], The Prince of Peace." - Isaiah 9:6

"And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him: And lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased."
- Matthew 3:16-17

"Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost" - Matthew 28:19

"And it came to pass in those days, that Jesus came from Nazareth of Galilee, and was baptized of John in Jordan. And straightway coming up out of the water, he saw the heavens opened, and the Spirit like a dove descending upon him: And there came a voice from heaven, saying, Thou art my beloved Son, in whom I am well pleased." - Mark 1:9-11

"And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God." - Luke 1:35

"And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased." - Luke 3:22

"In the beginning was the Word, and the Word was with God, and the Word was God." - John 1:1

"And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. And I saw, and bare record that this is the Son of God." - John 1:32-34

"...the Spirit...The Son...God [the Father] sent not his Son into the world to condemn the world... - John 3:6-18

Therefore the Jews sought the more to kill him, because he not only had broken the sabbath, but said also that God was his Father, making himself equal with God. - John 5:18

"I and my Father are one. Then the Jews took up stones again to stone him. Jesus answered them, Many good works have I shewed you from my Father; for which of those works do ye stone me? The Jews answered him, saying, For a good work we stone thee not; but for blasphemy; and because that thou, being a man, makest thyself God." - John 10:30-33

"Philip saith unto him, Lord, shew us the Father, and it sufficeth us. Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father? Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I am in the Father, and the Father in me" - John 14:8-11

"And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you." - John 14:16-17

"Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him. He that loveth me not keepeth not my sayings: and the word which ye hear is not mine, but the Father's which sent me. These things have I spoken unto you, being yet present with you. But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you." - John 14:23-26

"But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me" - John 15:26

"Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come. He shall glorify me: for he shall receive of mine, and shall shew it unto you. All things that the Father hath are mine: therefore said I, that he shall take of mine, and shall shew it unto you." - John 16:13-15

"...then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you. Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing. And Thomas answered and said unto him, My Lord and my God. - John 20:26-28

"This Jesus hath God raised up, whereof we all are witnesses. Therefore being by the right hand of God exalted, and having received of the Father the promise of the Holy Ghost, he hath shed forth this, which ye now see and hear." - Acts 2:32-33

"The God of our fathers raised up Jesus, whom ye slew and hanged on a tree. Him hath God exalted with his right hand to be a Prince and a Saviour, for to give repentance to Israel, and forgiveness of sins. And we are his witnesses of these things; and so is also the Holy Ghost, whom God hath given to them that obey him." - Acts 5:30-32

"The Spirit itself beareth witness with our spirit, that we are the children of God: And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together." - Romans 8:16-17

"...Christ came, who is over all, God blessed for ever. Amen." - Romans 9:5

"Now there are diversities of gifts, but the same Spirit. And there are differences of administrations, but the same Lord. And there are diversities of operations, but it is the same God which worketh all in all." -1 Corinthians 12:4-6

"Now he which stablisheth us with you in Christ, and hath anointed us, is God; Who hath also sealed us, and given the earnest of the Spirit in our hearts." - 2 Corinthians 1:21-22

"The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, be with you all. Amen." - 2 Corinthians 13:14

"Christ Jesus...Father...Holy Spirit"- Ephesians 1:1-14

"For through him we both have access by one Spirit unto the Father. Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;
And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone" - Ephesians 2:18-20

"That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man; That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, May be able to comprehend with all saints what is the breadth, and length, and depth, and height; And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God." - Ephesians 3:16-19

"There is one body, and one Spirit, even as ye are called in one hope of your calling;
One Lord, one faith, one baptism, One God and Father of all, who is above all, and through all, and in you all." - Ephesians 4:4-6

"...be filled with the Spirit; ...Giving thanks always for all things unto God and the Father in the name of our Lord Jesus Christ..." - Ephesians 5:18-20

"We give thanks to God and the Father of our Lord Jesus Christ... love in the Spirit." - Colossians 1:3-8

"Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ. For in Him dwelleth all the fulness of the Godhead bodily." - Colossians 2:8-9

"...Lord Jesus Christ, in the sight of God and our Father...the Holy Ghost..." - 1 Thessalonians 1:2-5

"...God...the Spirit...Lord Jesus Christ." - 2 Thessalonians 2:13-14

"Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ" - Titus 2:13

"But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom. Thou hast loved righteousness, and hated iniquity; therefore God, even thy God, hath anointed thee with the oil of gladness above thy fellows. And, Thou, Lord, in the beginning hast laid the foundation of the earth; and the heavens are the works of thine hands" - Hebrews 1:8-12

"How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?" - Hebrews 9:14

"Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied." 1 Peter 1:2

"...through the righteousness of God and our Saviour Jesus Christ" - 2 Peter 1:1

"...God...His Son Jesus Christ...the Spirit..." 1 John 3:21-24

"For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one." - 1 John 5:7

"And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life." - 1 John 5:20

"But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,
Keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life." - Jude 1:20-21

"And the four beasts...and they rest not day and night, saying, Holy, Holy, Holy, Lord God Almighty, which was, and is, and is to come." - Revelation 4:8


CROSS REFERENCES:

The Great "I AM"

1. "Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am. Then took they up stones to cast at him: but Jesus hid himself, and went out of the temple, going through the midst of them, and so passed by." - John 8:58-59
2. "And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you." - Exodus 3:14
   

MUCH MORE TO COME