Luke 1:57,58

Ver57. Now Elisabeth's full time came that she should be delivered; and she brought forth a son. 58. And her neighbors and her cousins heard how the Lord had shown great mercy upon her and they rejoiced with her.

AMBROSE; If you carefully observe, you will find that the word signifying fullness is no where used except at the birth of the righteous. Hence it is said, Now Elisabeth's full time came. For the life of the righteous has fullness, but the days of the wicked are empty.

CHRYS. And for that reason the Lord kept back the delivery of Elisabeth, that her joy might be increased, and her fame the greater. Hence it follows, And her neighbors and cousins heard, &c. For they who had known her barrenness were made the witnesses of the Divine grace, and no one seeing the child departed in silence, but gave praise to God, Who had vouchsafed him beyond their expectation.

AMBROSE; For the bringing forth of saints causes the rejoicing of many; it is a common blessing; for justice is a public virtue, and therefore at the birth of a just man a sign of hi future life is sent beforehand and, the grace of the virtue which is to follow is represented, being foreshadowed by the rejoicing of the neighbors.