All this we know both from the testimonies of Holy Scripture1 and from the respective works of the three Persons, and especially those we perceive in ourselves. The testimonies of Scripture which lead us to
believe this Holy Trinity are written in many places of the Old Testament. It is not necessary to mention them all; it is sufficient to select some with discretion.

In the book of Genesis God says, “Let Us make man in our image after our likeness…So God created man in His own image…; male and female He created them” (Gen 1:26-27). Also: “Behold, the man has become like one of Us” (Gen 3:22). From God’s saying, “Let Us make man in Our image,” it appears that there are more divine persons than one; and when He says, “God created,” He indicates that there is one God. It is true, He does not say how many persons there are, but what seems to be somewhat obscure in the Old Testament is very plain in the New Testament. For when our Lord was baptized in the river Jordan, the voice of the Father was heard, who said, “This is My beloved Son” (Mt 3:17); the Son was seen in the water, and the Holy Spirit descended upon Him in bodily form as a dove.2 For the baptism of all believers Christ prescribed this formula: “Baptize all nations into the Name of the Father, and of the Son, and of the Holy Spirit” (Mt 28:19). In the gospel according to Luke the angel Gabriel thus addressed Mary, the mother of our Lord: “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy, the Son of God” (Lk 1:35). Likewise: “The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all” (2 Cor 13:14). In all these places we are fully taught that there are three persons in one only divine essence.

Although this doctrine far surpasses all human understanding, nevertheless in this life we believe it on the ground of the Word of God, and we expect to enjoy its perfect knowledge and fruit hereafter in heaven.

Moreover, we must observe the distinct offices and works of these three Persons towards us. The Father is called our Creator by His power; the Son is our Saviour and Redeemer by His blood; the Holy Spirit is our Sanctifier by His dwelling in our hearts. The doctrine of the Holy Trinity has always been maintained and preserved in the true church since the time of the apostles to this very day, over against Jews, Muslims, and against false Christians and heretics such as Marcion, Mani, Praxeas, Sabellius, Paul of Samosata, Arius, and such like, who have been justly condemned by the orthodox fathers. In this doctrine, therefore, we willingly receive the three creeds, of the Apostles, of Nicea, and of Athanasius; likewise that which in accordance with them is agreed upon by the early fathers.

1 Jn 14:16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;

15:26 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:


Acts 2:32-33 This Jesus hath God raised up, whereof we all are witnesses. 33 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.


Rom 8:9  But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.

Gal 4:6 And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.

Tit 3:4-6 But after that the kindness and love of God our Saviour toward man appeared, 5 Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; 6 Which he shed on us abundantly through Jesus Christ our Saviour;

1 Pt 1:2 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 Jn 4:13-14 Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit. 14 And we have seen and do testify that the Father sent the Son to be the Saviour of the world.

1 Jn 5:1-12 Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him. 2 By this we know that we love the children of God, when we love God, and keep his commandments. 3 For this is the love of God, that we keep his commandments: and his commandments are not grievous. 4 For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith. 5 Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?

   6 This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth. 7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. 8 And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one. 9 If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son.  10 He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. 11 And this is the record, that God hath given to us eternal life, and this life is in his Son. 12 He that hath the Son hath life; and he that hath not the Son of God hath not life.[/i]

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

Rev 1:4-5 Rev 1:4-5 John to the seven churches which are in Asia: Grace be unto you, and peace, from him which is, and which was, and which is to come; and from the seven Spirits which are before his throne; 5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,

2Mt 3:16  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: