"For the glorious feast of the Epiphany of the Lord, it is an old and holy tradition to mark the doors of homes with blessed chalk. The letters have two meanings. They are the initials of the traditional names of the Three Magi: Caspar, Melchior, and Balthasar. They also abbreviate the Latin words Christus mansionem benedicat: 'May Christ bless the house.' The letters recall the day on which the inscription is made, as well as the purpose of blessing.
The crosses represent the protection of the Precious Blood of Christ, Whose Sacred Name we invoke, and also the holiness of the Three Magi sanctified by their adoration of the Infant Christ.
The inscription is made above the front door, so that all who enter and depart this year may enjoy God’s blessing. The month of January still bears the name of the Roman god Janus, the doorkeeper of heaven and protector of the beginning and end of things. This blessing 'christens' the ancient Roman observance of the first month. The inscription is made of chalk, a product of clay, which recalls the human nature taken by the Adorable and Eternal Word of God in the womb of the Virgin Mary, by the power of the Holy Spirit."
