Bede the Venerable, on Luke 1:26

“And in the sixth month, the angel Gabriel was sent from God into a city of Galilee, called Nazareth,”

“Because either the Incarnation of Christ was to be in the sixth age of the world, or because it was to serve to the fulfilling of the law, rightly in the sixth month of John’s conception was an angel sent to Mary, to tell her that a Saviour should be born. Hence it is said, And in the sixth month, &c. We must understand the sixth month to be March, on the twenty-fifth day of which our Lord is reported to have been conceived, and to have suffered, as also to have been born on the twenty-fifth day of December. But if either the one day we believe to be the vernal equinox, or the other the winter solstice, it happens that with the increase of light He was conceived or born Who lighteneth every man that cometh into the world. But if any one shall prove, that before the time of our Lord’s nativity or conception, light began either to increase, or supersede the darkness, we then say, that it was because John, before the appearance of His coming, began to preach the kingdom of heaven.”

Imported from an open dataset — not yet checked against the printed edition.