The Fourth Lateran Council (1215) declared: ‘We firmly believe and simply confess that there is only one true God, eternal and immeasurable, almighty, unchangeable, incomprehensible and ineffable, Father, Son and Holy Spirit, three persons but one absolutely simple essence, substance or nature.’ (Constitutions: 1. Confession of faith).
The Council of Basel (1431-45 A.D.) decreed: ‘First, then, the holy Roman church, founded on the words of our Lord and Saviour, firmly believes, professes and preaches one true God, almighty, immutable and eternal, Father, Son and Holy Spirit; one in essence, three in persons……………… These three persons are one God not three gods, because there is one substance of the three, one essence, one nature, one Godhead, one immensity, one eternity……. Therefore it condemns, reproves, anathematizes and declares to be outside the body of Christ, which is the church, whoever holds opposing or contrary views. Hence it condemns Sabellius, who confused the persons and altogether removed their real distinction. It condemns the Arians, the Eunomians and the Macedonians who say that only the Father is true God and place the Son and the holy Spirit in the order of creatures. It also condemns any others who make degrees or inequalities in the Trinity.’ (Session 114).
The third-century church father Tertullian writes: ‘Father and Son and Spirit are three, however, not in status but in rank, not in substance but in form, not in power but in appearance; they are, however, of one substance and of one status and of one power, because God is one, from whom these ranks and forms and appearances are designated in name as Father and Son and Holy Spirit.’ (Adversus Praxean; Chapter 2).
Trinitarians believe that within the Godhead (the ‘one Substance’) the Father is entirely within the Son and entirely within the Holy Spirit. The Son is entirely within the Father and entirely within the Holy Spirit. The Holy Spirit is entirely within the Father and entirely within the Son. In other words, the three Persons form a single unity, indivisible and permanent. They are not three persons standing side by side, so to speak.
In his ‘Fundamentals of Catholic Dogma’ Ludwig Ott cites the following ‘Trinitarian Formulae’ (by which he means ‘scriptural proofs’:
‘And when Jesus had been baptised he at once came up from the water, and suddenly the heavens opened and he saw the Spirit of God descending like a dove and coming down on him. And suddenly there was a voice from heaven, “This is my Son, the Beloved; my favour rests on him.”' (Matthew 3:16-17. See also Luke 3:22; John 1:32; Matt 17:5; 2 Peter 1:17).
‘Go, therefore, make disciples of all nations; baptise them in the name of the Father and of the Son and of the Holy Spirit.’ (Matthew 28:19).
‘The angel answered, “'The Holy Spirit will come upon you, and the power of the Most High will cover you with its shadow. And so the child will be holy and will be called Son of God.”’ (Luke 1:35).
‘Jesus said: “I am the Way; I am Truth and Life. No one can come to the Father except through me.”’ (John 14:6).
‘Peter, apostle of Jesus Christ, to all those living as aliens in the Dispersion of Pontus, Galatia, Cappadocia, Asia and Bithynia, who have been chosen, in the foresight of God the Father, to be made holy by the Spirit, obedient to Jesus Christ and sprinkled with his blood: Grace and peace be yours in abundance.’ (1 Peter 1:1-2).
‘The grace of the Lord Jesus Christ, the love of God and the fellowship of the Holy Spirit be with you all.’ (2 Cor 13:13).
‘There is one Body, one Spirit, just as one hope is the goal of your calling by God. There is one Lord, one faith, one baptism, and one God and Father of all, over all, through all and within all.’ (Ephesians 4:4-6).
To which may be added: ‘I came from the Father and have come into the world, and now I am leaving the world and going to the Father.’ (John 16:28. See also John 16:17).
Ott makes no mention of this:
‘For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.’ (1 John 5: 7-8).
The words shown in bold are known as the ‘Comma Ioanneum’.
Anthony and Richard Hanson write: ‘It (the ‘Comma Ioanneum’) was added by some enterprising person or persons in the ancient Church who felt that the New Testament was sadly deficient in direct witness to the kind of doctrine of the Trinity which he favoured and who determined to remedy that defect . . . It is a waste of time to attempt to read Trinitarian doctrine directly off the pages of the New Testament’. (‘Reasonable Belief: A Survey of the Christian Faith; page 171).
The ‘Comma Ioanneum’ is spurious, and yet for centuries the Church insisted it be included in 1 John 5; on the grounds that it had become official Church teaching.
In 1927, the Holy Office (Guardian of Catholic orthodoxy; and once named the ‘Supreme Sacred Congregation of the Roman and Universal Inquisition’) declared: ‘After careful examination of the whole circumstances that its genuineness could be denied’ (Ludwig Ott: ‘Fundamentals of Catholic Dogma’, page 56).
This is why my Bible (the Jerusalem Bible - a Catholic version) reads: ‘So there are three witnesses, the Spirit, water and blood; and the three of them coincide.’ By the way, another Catholic Bible – the Douay Rheims – still contains the ‘Comma’.