St. Gregory Nazianzen

Christ is born, glorify Him! Christ from heaven, go out to meet Him! Christ on earth, be exalted! Sing to the Lord all the whole earth; and that I may join both in one word, let the heavens rejoice, and let the earth be glad, for Him who is of heaven and then of earth. Christ in the flesh, rejoice with trembling and with joy; with trembling because of your sins, with joy because of your hope.

 St. Leo the Great

Dearly beloved, today our Saviour is born; let us rejoice. Sadness should have no place on the birthday of life. The fear of death has been swallowed up; life brings us joy with the promise of eternal happiness. No one is shut out from this joy; all share the same reason for rejoicing. Our Lord, victor over sin and death, finding no man free from sin, came to free us all.