The Feast of the Holy Trinity

The word Trinity is not found in scripture. The teaching is there, however, in power and truth. The doctrine which had been taught by Jesus in the Great Commission

"baptizing them in the name of the Father, Son and Holy Spirit"

had been handed down to faithful men who handed it down to faithful men. When heresy raised it's ugly head, the Church defined the doctrine at the Councils of Nicea and Constantinople.

As Fr Mike taught us this evening in the homily, The Father gives life to the Son, the Son gives his life back to the Father, and this Holy Bond is the Love and unity of the Holy Spirit. We are brought into this Fellowship by our Baptism...

"for no one can enter the kingdom of God unless he is born of water and Spirit"

and we remain in the kingdom by our faith and obedience

"teaching them to observe all that I have commanded you."

The Spirit we receive at Baptism bears witness that we are children of God

"For those who are led by the Spirit of God are sons of God. For you did not receive a spirit of slavery to fall back into fear but you received a Spirit of adoption, through whom we cry, "Abba, Father!" The Spirit himself bears witness with our spirit that we are children of God, and if children, then heirs,heirs of God and joint heirs with Christ, if only we suffer with him so that we may also be glorified with him."

A letter by St Athanasius

Light, radiance and grace are in the Trinity and from the Trinity

It will not be out of place to consider the ancient tradition, teaching and faith of the Catholic Church, which was revealed by the Lord, proclaimed by the apostles and guarded by the fathers. For upon this faith the Church is built, and if anyone were to lapse from it, he would no longer be a Christian either in fact or in name.
We acknowledge the Trinity, holy and perfect, to consist of the Father, the Son and the Holy Spirit. In this Trinity there is no intrusion of any alien element or of anything from outside, nor is the Trinity a blend of creative and created being. It is a wholly creative and energising reality, self-consistent and undivided in its active power, for the Father makes all things through the Word and in the Holy Spirit, and in this way the unity of the holy Trinity is preserved. Accordingly, in the Church, one God is preached, one God who is above all things and through all things and in all things. God is above all things as Father, for he is principle and source; he is through all things through the Word; and he is in all things in the Holy Spirit.
Writing to the Corinthians about spiritual matters, Paul traces all reality back to one God, the Father, saying: Now there are varieties of gifts, but the same Spirit; and varieties of service, but the same Lord; and there are varieties of service but the same Lord; and there are varieties of working, but it is the same God who inspires them all in everyone.
Even the gifts that the Spirit dispenses to individuals are given by the Father through the Word. For all that belongs to the Father belongs also to the Son, and so the graces given by the Son in the Spirit are true gifts of the Father. Similarly, when the Spirit dwells in us, the Word who bestows the Spirit is in us too, and the Father is present in the Word. This is the meaning of the text: My Father and I will come to him and make our home with him. For where the light is, there also is the radiance; and where the radiance is, there too are its power and its resplendent grace.
This is also Paul’s teaching in his second letter to the Corinthians: The grace of our Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all. For grace and the gift of the Trinity are given by the Father through the Son in the Holy Spirit. Just as grace is given from the Father through the Son, so there could be no communication of the gift to us except in the Holy Spirit. But when we share in the Spirit, we possess the love of the Father, the grace of the Son and the fellowship of the Spirit himself.