Here’s more of St. Augustine, and St. Basil the Great’s On the Holy Spirit:
“It might, I suppose, be argued that his saying ‘I shall ask the Father, and he will give you another advocate’ really suggests that the Son by himself does not suffice. Here, on the other hand, is a passage where the Holy Spirit is spoken of as absolutely sufficing by himself: ‘When he, the Spirit of Truth comes, he will teach you all truth’ (John 16:13). Is the Son then to be excluded here, as though he did not teach all truth, or as though the Holy Spirit had to supplement what the Son was less able to teach? Let them say if thy like, then, that the Holy Spirit whom they usually call inferior to the Son is greater than he. Or perhaps because it does not say “he alone,” or “nobody but he will teach you all truth,” they will allow us to believe that the Son also teaches with him? Then the apostle in that case excluded the Son from knowing the things that are of God when he said, ‘Thus also the things that are of God no one knows but the Spirit of God’ (1 Corinthians 2:11). So now these perverse people are in a position to say that even the Son is only taught the things that are of God by the Holy Spirit, as an inferior by a superior;” (Book I Chapter 3)
“Then again, what about ‘He who believes in me does not believe in me’ (John 12:44)? In him and not in him – how? How is such a self-contradiction to be understood – ‘He who believes in me,’ he says, ‘ does not believe in me, but in him who sent me’ – unless you take it like this: “He who believes in me does not believe in what he sees,” or our hope would in that case be in something created, but he believes in him who took a created form in which to appear to human eyes, and thereby to purify our minds for contemplating him by faith in his equality with the Father? So when he directs the aim of our faith onto the Father and says ‘does not believe in me but in him who sent me,’ he does not of course want to separate himself from the Father, from him that is who sent him. He wants us to believe in him in the same way as we do in the Father whose equal he is. He says as much quite explicitly elsewhere: ‘Believe in God, believe in me too’ (John 14:1), which amounts to, “Just as you believe in God, so too in me, because I and the Father are one God.”” (Book I Chapter 4)
“There are those others which mark him neither as less nor as equal, but only intimate that he is from the Father, like ‘As the Father has life in himself, so he also gave the Son to have life in himself’ (John 5:26), and ‘Neither can the Son do anything of himself except what he sees the Father doing (John 5:19). If we take the reason for his saying this to be that in the creaturely form he took the Son is less than the Father, it will follow that the Father must first have walked upon the water, and with spittle and mud opened the eyes of another man born blind, and done all the other things done by the Son when he appeared among men in the flesh, to enable the Son to do them too, who as he said could do nothing of himself except what he say the Father doing. Surely nobody, even out of his wits, could have such an idea. So the reason for these statements can only be that the life of the Son is unchanging like the Father’s, and yet is from the Father; and that the work of the Father and Son is indivisible, and yet the Son’s working is from the Father just as he himself is from the Father; and the way in which the Son sees the Father is simply by being the Son.” (Book II Chapter 1)
“‘The Lord does say, ‘When he comes, the Spirit of truth, he will teach you all truth. For he will not speak from himself, but whatever he hears will speak, and will tell you of the things that are to come. He will glorify me, because he will receive of mine and will tell it to you’ (John 16:14)… This is the moment for those people to wake up if they can, who have imagined that they are supported in proving the Father to be greater than the Son by the Son’s saying, ‘Father, glorify me’ (John 17:5). For here we have the Holy Spirit glorifying him; is he too greater than the Son?” (Book II Chapter 1)
“The Holy Spirit is unmistakably called Lord – where the apostle says, ‘And the Spirit is Lord’ (2 Corinthians 3:17); and in case anyone should consider that he means the Son, and is calling him spirit because of his immaterial substance, he goes on to add, ‘Where the Lord’s Spirit is, there is freedom too’ (2 Corinthians 3:17). And no one can doubt that the Lord’s Spirit is the Holy Spirit.” (Book II Chapter 4)
ST. BASIL THE GREAT’S ‘ON THE HOLY SPIRIT’
“‘There is one God, the Father, from whom are all things… and one Lord Jesus Christ through whom are all things.’ (1 Cor. 8:6) St. Paul does not say this to lay down an arbitrary law of prepositions, but to distinguish between the persons. He writes this not to introduce any division of natures, but to prove that the union of Father and Son is without confusion. It is obvious that the phrases in this passage do not contradict each other, nor do they separate the natures to which they are applied, like army squadrons facing each other in battle. The blessed Paul unites both for the same purpose when he says, ‘for from him and through him and to him are all things.’” (Chapter 5 Section 7)
“‘Sit at my right hand,’ and ‘…He sat down at the right hand of the majesty of God.’ The expression ‘right hand’ does not indicate a lower place as they contend, but a relationship of equality. It cannot be understood as the physical right hand, but rather the Scripture emphasizes the magnificence of the Son’s great dignity. It remains for our opponents to explain how this phrase indicates inferior rank. Let them learn that Christ is the power of God and the wisdom of God (1 Cor 1:24), and the image of the invisible God (Col 1:15), and the brightness of His glory (Heb 1:3), and the one whom God the Father has sealed (John 6:27), whom the Father has stamped with the image of His Person.