7 But lest any one from simplicity or perverse ingenuity should suppose that Christ is but equal in honour to righteous men, from His saying, I ascend to My Father, and your Father, it is well to make this distinction beforehand, that the name of the Father is one, but the power of His operation manifold. And Christ Himself knowing this has spoken unerringly, I go to My Father, and your Father: not saying 'to our Father,' but distinguishing, and saying first what was proper to Himself, to My Father, which was by nature; then adding, and your Father, which was by adoption. For however high the privilege we have received of saying in our prayers, Our Father, which art in heaven, yet the gift is of loving-kindness. For we call Him Father, not as having been by nature begotten of Our Father which is in heaven; but having been transferred from servitude to sonship by the grace of the Father, through the Son and Holy Spirit, we are permitted so to speak by ineffable loving-kindness.
Source: Catechetical Lectures (New Advent)