
Ambrose of Milan
Catena Aurea · Lukasevangelium 2
And Joseph and his mother marvelled at those things which were spoken of him. And Simeon blessed them, and said unto Mary his mother, Behold, this child is set for the fall and rising again of many in Israel; and for a sign which shall be spoken against; (Yea, a sword shall pierce through thy own soul also,) that the thoughts of many hearts may be revealed.
That is, to distinguish the merits of the just and the unjust, and according to the quality of our deeds, as a true and just Judge, to decree punishment or rewards.