V. Chastity and charity are the two things most needful in preparing for Easter Communion
Seeing therefore, dearly-beloved, that God's Mercy is so great, that He has deigned to justify by faith many even from among such a nation, and had adopted into the company of the patriarchs and into the number of the chosen people us who were once perishing in the deep darkness of our old ignorance, let us mount to the summit of our hopes not sluggishly nor in sloth; but prudently and faithfully reflecting from what captivity and from how miserable a bondage, with what ransom we were purchased, by how strong an arm led out, let us glorify God in our body: that we may show Him dwelling in us, even by the uprightness of our manner of life.
And because no virtues are worthier or more excellent than merciful loving-kindness and unblemished chastity, let us more especially equip ourselves with these weapons, so that, raised from the earth, as it were on the two wings of active charity and shining purity, we may win a place in heaven. And whosoever, aided by God's grace, is filled with this desire and glories not in himself, but in the Lord, over his progress, pays due honour to the Easter mystery. His threshold the angel of destruction does not cross, for it is marked with the Lamb's blood and the sign of the cross. He fears not the plagues of Egypt, and leaves his foes overwhelmed by the same waters by which he himself was saved.
And so, dearly-beloved, with minds and bodies purified let us embrace the wondrous mystery of our salvation, and, cleansed from all “the leaven of our old wickedness, let us keep” the Lord's Passover with due observance: so that, the Holy Spirit guiding us, we may be “separated” by no temptations “from the love of Christ,” Who bringing peace by His blood to all things, has returned to the loftiness of the Father's glory, and yet not forsaken the lowliness of those who serve Him to Whom is the honour and the glory for ever and ever. Amen.
Source: Sermons (New Advent)