Luke 1:24

And therefore he says, Five months, that is, until Mary should conceive, and her babe leaping with joy should prophesy.

What reason then for concealment, except shame? For there are certain allowed times in wedlock, when it is becoming to attend to the begetting of children; while the years thrive, while there is hope of child-bearing. But when in good time old age has come on, and the period of life is more fitted for governing children, than begetting them, it is a shame to bear about the signs of pregnancy, however lawful. It is a shame to be laden with the burden of another age, and for the womb to swell with the fruit of not one's own time of life. It was a shame then to her on account of her age; and hence we may understand the reason why they did not at this time come together, for surely she who blushed not at their coming together in their old age, would not blush at her child-bearing; and yet she blushes at the parental burden, while she yet is unconscious of the religious mystery. But she who hid herself because she had conceived a son, began to glory that she carried in her womb a prophet.

Truly He has loosed her barrenness, a supernatural gift He has bestowed upon her, and the unfruitful rock has produced the green blade. He has taken away her disgrace, in that He has made her to bring forth. Hence it follows: In the days wherein he looked on me, to take away my reproach among men. (Homil. de Anna.) Her joy therefore is twofold. The Lord has taken away from her the mark of barrenness, and also given her an illustrious offspring. In the case of other births, the coming together of the parents only occurs; this birth was the effect of heavenly grace.

Now mystically by Zacharias may be signified the Jewish Priesthood, by Elisabeth the law itself; which, well administered by the teaching of the Priests, ought to have borne spiritual children to God, but was not able, because the Law made no one perfect. (Heb. 7:19, 1 Tim. 1:8.) Both were just, because the law is good, and the Priesthood for that time holy; both were well stricken in years, because at Christ's coming both the Law and Priesthood were just bending to old age. Zacharias enters the temple, because it is the priest's office to enter into the sanctuary of heavenly mysteries. There was a multitude without the doors, because the multitude cannot penetrate mysteries. When he places frankincense on the altar, he discovers that John will be born; for while the teachers are kindled with the flame of divine reading, they find the grace of God flow to them through Jesus: and this is done by an angel, for the Law was ordained by angels. (Gal. 3:19.) And yet Elisabeth conceives John, because the more inward parts of the Law abound with sacraments of Christ. She conceals her conception five months, because Moses in five books set forth the mysteries of Christ; or because the dispensation of Christ is represented by the words or deeds of the saints, in the five ages of the world.

During the time of their course, the priests of the temple were so occupied by their office, that they kept themselves not only from the society of their wives, but even from the very threshold of their houses. Hence it is said, And it came to pass, that, as soon as the days were accomplished, &c. For as there was then required a priestly succession from the root of Aaron, of necessity then a time was appointed for keeping up the inheritance. But as now not a carnal succession, but spiritual perfection, is looked for, the priests are enjoined (in order that they might ever be able to serve the altar) the perpetual observance of chastity. It follows: But after those days, &c. that is, after the days of Zacharias's ministration were completed. But these things were done in the month of September, the twenty-second day of the month, upon which the Jews were bound to observe the feast of the Tabernacles, just before the equinox, at which the night began to be longer than the day, because Christ must increase, but John must decrease. And those days of fasting were not without their meaning; for by the mouth of John, repentance and mortification were to be preached to men. It follows: And she hid herself. (see John 3:30.)