On Baptism and the Holy Spirit

For as the faith in the Triad, which has been delivered to us, joins us to God; and as he who takes anything away from the Triad, and is baptized in the name of the Father alone, or in the name of the Son alone, or in the Father and the Son without the Holy Spirit, receives nothing, but remains ineffective and uninitiated, both himself and he who is supposed to initiate him (for the rite of initiation is in the Triad); so he who divides the Son from the Father, or who reduces the Spirit to the level of the creatures, has neither the Son nor the Father, but is without God, worse than an unbeliever, and anything rather than a Christian. And justly so. For as baptism, which is given in Father, Son, and Holy Spirit, is one; and as there is one faith in the Triad (as the Apostle said); so the holy Triad, being identical with Itself and united within Itself, has in It nothing which belongs to things originate. This is the indivisible unity of the Triad; and faith therein is one. But if, from the new discovery you Tropici have made, it is not so; if you have dreamed dreams of calling the Holy Spirit a creature — then you no longer have one faith and one baptism, but two, one in the Father and the Son, another in an angel who is a creature. There is no security or truth left you. For what communion can there be between that which is originate and that which creates ? What unity between the lower creatures and the Word who created them? Knowing this, the blessed Paul does not divide the Triad as you do; but, teaching Its unity, when he wrote to the Corinthians concerning things spiritual, he finds the source of all things in one God, the Father, saying: ‘There are diversities of gifts, but the same Spirit. And there are diversities of ministrations, but the same Lord. And there are diversities of workings, but the same God who worketh all things in all.’ The gifts which the Spirit divides to each are bestowed from the Father through the Word. (Letters to Serration, Epistle 1.30)