Ascension of the Lord: Theosis in the Roman Church?

From the first sermon on the Ascension of Pope St. Leo the Great:

"After the blessed and glorious Resurrection of our Lord Jesus Christ, wherein the Divine Power raised up in three days the true Temple of God Which the iniquity of the Jews had destroyed, God was pleased to ordain, by His Most Sacred Will, and in His Providence for our instruction and the profit of our souls, a season of forty days which season, dearly beloved brethren, doth end on this day. During that season the bodily Presence of the Lord still lingered on earth, that the reality of the fact of His having risen again from the dead might be armed with all needful proofs. The death of Christ had troubled the hearts of many of His disciples their thoughts were sad when they remembered His agony upon the Cross, His giving up of the Ghost, and the laying in the grave of His lifeless Body, and a sort of hesitation had begun to weigh on them.

"Hence the most blessed Apostles and all the disciples, who had been fearful at the finishing on the Cross, and doubtful of the trustworthiness of the rising again, were so strengthened by the clear demonstration of the fact, that, when they saw the Lord going up into the height of heaven, they sorrowed not, nay they were even filled with great joy And, in all verity, it was a great an unspeakable cause for joy to see the Manhood, in the presence of that the multitude of believers, exalted above all creatures even heavenly, rising above the ranks of the angelic armies and speeding Its glorious way where the most noble of the Archangels lie far behind, to rest no lower than that place where high above all principality and power, It taketh Its seat at the right hand of the Eternal Father, Sharer of His throne, and Partaker of His glory, and still of the very man's nature which the Son hath taken upon Him.

"Therefore, dearly beloved brethren, let us also rejoice with worthy joy, for the Ascension of Christ is exaltation for us, and whither the glory of the Head of the Church is passed in, thither is the hope of the body of the Church called on to follow. Let us rejoice with exceeding great joy, and give God glad thanks. This day is not only the possession of Paradise made sure unto us, but in the Person of our Head we are actually begun to enter into the heavenly mansions above. Through the unspeakable goodness of Christ we have gained more than ever we lost by the envy of the devil. We, whom our venomous enemy thrust from our first happy home, we, being made of one body with the Son of God, have by Him been given a place at the right hand of the Father with Whom He liveth and reigneth, in the unity of the Holy Ghost, one God, world without end. Amen."

Christ Is Born! Glorify Him!

From the first Christmas Day sermon of Pope St. Leo the Great:

Dearly beloved brethren, Unto us is born this day a Saviour, Luke ii. 11. Let us rejoice. It would be unlawful to be sad to-day, for today is Life's Birthday; the Birthday of that Life, Which, for us dying creatures, taketh away the sting of death, and bringeth the bright promise of the eternal gladness hereafter. It would be unlawful for any man to refuse to partake in our rejoicing. All men have an equal share in the great cause of our joy, for, since our Lord, Who is the destroyer of sin and of death, findeth that all are bound under the condemnation, He is come to make all free. Rejoice, O thou that art holy, thou drawest nearer to thy crown! Rejoice, O thou that art sinful, thy Saviour offereth thee pardon! Rejoice also, O thou Gentile, God calleth thee to life! For the Son of God, when the fulness of the time was come, which had been fixed by the unsearchable counsel of God, took upon Him the nature of man, that He might reconcile that nature to Him Who made it, and so the devil, the inventor of death, is met and beaten in that very flesh which hath been the field of his victory.

When our Lord entered the field of battle against the devil, He did so with a great and wonderful fairness. Being Himself the Almighty, He laid aside His uncreated Majesty to fight with our cruel enemy in our weak flesh. He brought against him the very shape, the very nature of our mortality, yet without sin. Heb. iv. 15. His birth however was not a birth like other births for no other is born pure, nay, not the little child whose life endureth but a day on the earth. To His birth alone the throes of human passion had not contributed, in His alone no consequence of sin had had -part. For His Mother was chosen a Virgin of the kingly lineage of David, and when she was to grow heavy with the sacred Child, her soul had already conceived Him before her body. She knew the counsel of God announced to her by the Angel, lest the unwonted events should alarm her. The future Mother of God knew what was to be wrought in her by the Holy Ghost, and that her modesty was absolutely safe.

Therefore, dearly beloved brethren, let us give thanks to God the Father, through His Son, in the Holy Ghost: Who, for His great love wherewith He loved us, hath had mercy on us and, even when we were dead in sins, hath quickened us together with Christ, Eph. ii. 4, 5, that in Him we might be a new creature, and a new workmanship. Let us then put off the old man with his deeds (Col. iii. 9); and, having obtained a share in the Sonship of Christ, let us renounce the deeds of the flesh. Learn, O Christian, how great thou art, who hast been made partaker of the Divine nature, 2 Pet. i. 4, and fall not again by corrupt conversation into the beggarly elements above which thou art lifted. Remember Whose Body it is Whereof thou art made a member, and Who is its Head, (1 Cor. vi. 15.) Remember that it is He That hath delivered thee from the power of darkness and hath translated thee into God's light, and God's kingdom.

Christ is born! Glorify Him!