Ambrose of Milan
Catena Aurea · Lukasevangelium 1
There was in the days of Herod, the king of Judæa, a certain priest named Zacharias, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elisabeth. And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless. And they had no child, because that Elisabeth was barren, and they both were now well stricken in years.
Divine Scripture teaches us with respect to those whom we commemorate, that not only the characters of the men themselves, but of their parents also, ought to be praised, that they might be distinguished by an inheritance, as it were, handed down to them of unspotted purity. Now not only from his parents, but also from his ancestors, St. John derives his illustrious descent, a descent not exalted by secular power, but venerable from its sanctity. Complete then is that praise which comprehends birth, character, office, actions, and judgments.