14 Being, then, in the form of a servant, Jesus Christ, Who before was in the form of God, said as a man, I ascend to My Father and your Father, and My God and your God. He was speaking as a servant to servants: how can we then dissociate the words from Christ the servant, and transfer them to that nature, which had nothing of the servant in it? For He Who abode in the form of God took upon Him the form of a servant, this form being the indispensable condition of His fellowship as a servant with servants. It is in this sense that God is His Father and the Father of men, His God and the God of servants. Jesus Christ was speaking as a man in the form of a servant to men and servants; what difficulty is there then in the idea, that in His human aspect the Father is His Father as ours, in His servant's nature God is His God as all men's?
Source: On the Trinity (New Advent)