Sabbato Quattuor Temporum Quadragesimae ~ II. classis Commemoratio ad Laudes tantum: S. Petri Damiani Confessoris

From divinumofficium:

Oratio Orémus. V. Flectámus génua. R. Leváte. Pópulum tuum, quaesumus, Dómine, propítius réspice: atque ab eo flagella tuæ iracúndiæ cleménter avérte. Per Dominum nostrum Iesum Christum, Filium tuum: qui tecum vivit et regnat in unitate Spiritus Sancti Deus, per omnia saecula saeculorum. R. Amen.

Collect Let us pray. V. Let us kneel. R. Arise. Look graciously upon Your people, we beseech You, O Lord, and in Your mercy turn away from them the scourges of Your wrath. Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, ever one God, world without end. R. Amen.

From the Office of Matins:

Lectio 1 Lectio sancti Evangelii secundum Matthaeum. Matt 17:1-9 In illo tempore: Assumpsit Iesus Petrum, et Iacobum, et Ioannem fratrem eius, et duxit illos in montem excelsum seorsum: et transfiguratus est ante eos. Et reliqua. Homilia sancti Leonis Papae Homilia de Transfiguratione Domini. Evangelica lectio, dilectissimi, quae per aures corporis interiorem mentium nostrarum pulsavit auditum, ad magni sacramenti nos intelligentiam vocat: quam aspirante gratia Dei, facilius assequemur, si considerationem nostram ad ea, quae paulo superius sunt narrata, referamus. Salvator enim humani generis Iesus Christus, condens eam fidem, quae et impios ad iustitiam, et mortuos revocat ad vitam, ad hoc discipulos suos doctrinae monitis, et operum miraculis imbuebat, ut idem Christus et Unigenitus Dei, et hominis Filius crederetur. Nam unum horum sine altero non proderat ad salutem: et aequalis erat periculi, Dominum Iesum Christum aut Deum tantummodo sine homine, aut sine Deo solum hominem credidisse; cum utrumque esset pariter confitendum; quia sicut Deo vera humanitas, ita homini inerat vera divinitas. V. Tu autem, Dómine, miserére nobis. R. Deo grátias.

Reading 1 Continuation of the Holy Gospel according to Matthew Matt 17:1-9 In that time Jesus taketh unto him Peter and James, and John his brother, and bringeth them up into a high mountain apart: And he was transfigured before them. And so on. Homily by Pope St Leo the Great. On the Transfiguration of the Lord. Dearly beloved brethren, the Lesson from the Holy Gospel which, entering in by our bodily ears, hath knocked at the door of our inner mind, calleth us to understand a great mystery. This, by the grace of God, we shall the more readily do, if we return to consider what hath been told us just before. The Saviour of mankind, even Jesus Christ, laying the foundations of that faith whereby the ungodly are called to righteousness and the dead to life, instilled into the minds of His disciples, both by the voice of His teaching and the wonder of His works, that they should believe Him, the one Christ, to be both the Only-begotten Son of God and the Son of man. Had they believed Him one of these and not the other, it had availed them nothing to salvation; and the danger was equally great, of holding the Lord Jesus Christ to be God without the Manhood, or Man only without the Godhead, since we are constrained to acknowledge that He is perfect God and perfect Man, and that as there is in the Godhead perfect Manhood, so there is in the Manhood perfect Godhead. V. But thou, O Lord, have mercy upon us. R. Thanks be to God.