For unto us a Child is born, unto us a Son is given: and the government shall be upon His shoulder: and His name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.

Of the increase of His government and peace there shall be no end, upon the throne of David, and upon His Kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this. ~Isaiah 9:6-7

Ecce adest de quo prophete cecinerunt dicentes:

Puer natus est nobis,
Quem virgo Maria genuit,
et Filius datus est nobis,
nomen eius Emmanuel vocabitur,
cuius imperium super humerum eius,
et vocabitur nomen eius magni consilii angelus.

Rex lumen de lumine, eia! regnat in iusticia.
Cantate, eia! de Virginis fecundia. ~Versus Ante Officium, Winchester Troper (10th cent.)

To all our Orthodox brethren celebrating the Nativity of our Lord on the New Calendar and all non-Orthodox celebrating the birth of the Saviour, I send joyful greetings and wish all a merry Christmas!

Christ is Born! Glorify Him!
Christos razhdaetsya! Slavite!
Christos gennatai! Doxasate!