From a sermon by Saint Leo the Great, pope
The Lord has made his salvation known to the whole world

The loving providence of God determined that in the last days he would aid the world, set on its course to destruction. He decreed that all nations should be saved in Christ.

A promise had been made to the holy patriarch Abraham in regard to these nations. He was to have a countless progeny, born not from his body but from the seed of faith. His descendants are therefore compared with the array of the stars. The father of all nations was to hope not in an earthly progeny but in a progeny from above.

Let the full number of the nations now take their place in the family of the patriarchs. Let the children of the promise now receive the blessing in the seed of Abraham, the blessing renounced by the children of his flesh. In the persons of the Magi let all people adore the Creator of the universe; let God be known, not in Judea only, but in the whole world, so that his name may be great in all Israel.

Dear friends, now that we have received instruction in this revelation of God’s grace, let us celebrate with spiritual joy the day of our first harvesting, of the first calling of the Gentiles. Let us give thanks to the merciful God, who has made us worthy, in the words of the Apostle, to share the position of the saints in light; who has rescued us from the power of darkness, and brought us into the kingdom of his beloved Son. As Isaiah prophesied: the people of the Gentiles, who sat in darkness, have seen a great light, and for those who dwelt in the region of the shadow of death a light has dawned. He spoke of them to the Lord: The Gentiles, who do not know you, will invoke you, and the peoples, who knew you not, will take refuge in you.

This is the day that Abraham saw, and rejoiced to see, when he knew that the sons born of his faith would be blessed in his seed, that is, in Christ. Believing that he would be the father of the nations, he looked into the future, giving glory to God, in full awareness that God is able to do what he has promised.

This is the day that David prophesied in the psalms, when he said: All the nations that you have brought into being will come and fall down in adoration in your presence, Lord, and glorify your name. Again, the Lord has made known his salvation; in the sight of the nations he has revealed his justice.

This came to be fulfilled, as we know, from the time when the star beckoned the three wise men out of their distant country and led them to recognize and adore the King of heaven and earth. The obedience of the star calls us to imitate its humble service: to be servants, as best we can, of the grace that invites all men to find Christ.

Dear friends, you must have the same zeal to be of help to one another; then, in the kingdom of God, to which faith and good works are the way, you will shine as children of the light: through our Lord Jesus Christ, who lives and reigns with God the Father and the Holy Spirit for ever and ever. Amen.

Responsory

This is the glorious day on which Christ himself, the savior of the world, appeared; the prophets foretold him, the angels worshiped him;
— the Magi saw his star and rejoiced to lay their treasures at his feet.

God’s holy day has dawned for us at last; come, all you peoples, and adore the Lord.
— The Magi saw his star and rejoiced to lay their treasures at his feet.

Additional Reading:
Isaiah 60:1-22: The revelation of God’s glory over Jerusalem

Te Deum

You are God: we praise you;
You are the Lord: we acclaim you;
You are the eternal Father:
All creation worships you.

Save your people, Lord, and bless your inheritance.
— Govern and uphold them now and always.

Day by day we bless you.
— We praise your name for ever.

Keep us today, Lord, from all sin.
— Have mercy on us, Lord, have mercy.

Lord, show us your love and mercy,
— for we have put our trust in you.

In you, Lord, is our hope:
— And we shall never hope in vain.

The Cristeros Rule of Life

As Cristeros, we dedicate ourselves to a a life of true devotion to Jesus through Mary, particularly in the form of Our Lady of Guadalupe. Our Lady of Guadalupe, Pray for Us.

We begin our days with a Morning Offering dedicating our day:

O Jesus, through the Immaculate Heart of Mary, I offer you my prayers, works, joys and sufferings of this day, in union with the holy sacrifice of the Mass throughout the world, for the remission of my sins, for the intentions of my family and friends, and in particular for the intentions of the Holy Father. Amen.

At a high or low point during the day, we pray to the Holy Spirit, handing over our accomplishments or sufferings:

Come Holy Spirit, fill the hearts of thy faithful, and enkindle in us the fire of thy love, send forth thy spirit and we shall be created, and though shall renew the face of the earth. Amen.

At some point each day, on our own or with our family or friends, we pray to our Mother Mary in the form of Guadalupe, giving all that we have and are to Jesus through Mary by reciting one of the following:

• A daily Rosary, focusing on the Fruits of the Mystery.
• The Hail Holy Queen

Every night before we go to sleep, by ourselves or with our wife, we pray a nightly examine using the ACTS formula:

• Adoration: We adore you and Christ and we bless You, because by Your Holy Cross, You have redeemed the world.
• Contrition: Ask God for forgiveness for all the times you have sinned or fallen short that day,
• Thanksgiving: Thank God for all the gifts he has given you that day, including the grace for those moments you have acted virtuously and towards the Good.
• Supplication: We ask God for his blessings that night and the next day, either with particular requests or in general, and end with a prayer dedicating ourselves to Him through Our Lady of Guadalupe: All that we have and all that we are, we give to your hands Jesus, through the heart of Mary, your blessed mother. Amen. Our Lady of Guadalupe, Pray For us.