St. John Henry Newman: 'The Father and I are One' John 10.30

He who spoke was one really existing Person, and He, that one Living and Almighty Son, both God and man, was the brightness of God's glory and His Power, and wrought what His Father willed, and was in the Father and the Father in Him, not only in heaven but on earth. In heaven He was this, and did this, as God; and on earth He was this, and did this, in that manhood which He assumed, but whether in heaven, or on earth, still as the Son. It was therefore true of Him altogether, when He spoke, that He was not alone, nor spoke or wrought of Himself, but where He was, there was the Father, and whoso had seen Him had seen the Father, whether we think of Him as God or as man.

Again, we read in Scripture of His being sent by the Father, addressing the Father, interceding to Him for His disciples, and declaring to them that His Father is greater than He; in what sense says and does He all this? Some will be apt to say that He speaks only in His human nature; words which are perplexing to the mind that tries really to contemplate Him as Scripture describes Him, as if He were speaking only under a representation, and not in His Person. No; it is truer to say that He, that One All-gracious Son of God, who had been with the Father from the beginning, equal in all divine perfections and one in substance, but subordinate as being the Son,  as He had ever been His word, and Wisdom, and counsel, and Will, and Power in Heaven, — so after His incarnation, and upon the earth, still spoke and acted after, yet with, the Father as before, though in a new nature, which He had put on, and in humiliation.

This, then, is the second point of doctrine which I had to mention, that our Lord was not only God, but the Son of God. We know more than that God took on Him our flesh; though all is mysterious, we have a point of knowledge further and more distinct, viz. Chat it was neither the Father for the Holy Ghost, but the Son of the Father, God the Son, God from God, and Light from Light, who came down upon earth, and who thus, though graciously taking on Him a new nature, remained in Person as He had been from everlasting, the Son of the Father, and spoke and acted towards the Father as a Son.

Christ, the Son of God made Man PPS VI p. 59-61. 26 April, 1836