From the early Church Fathers to now.
“But her end is bitter as wormwood, and sharp as a two-edged sword.”
“"In the end," [Solomon] says, "you will find what seemed sweet in the beginning to be more bitter than gall and sharper than the edge of a sword." But the nature of righteousness is the opposite: In the beginning, it seems more bitter, but in the end, when it produces fruits of virtue, it is found to be sweeter than honey.”
“But her end is bitter, etc. The drink of wormwood becomes bitter within the bowels, outwardly the members are wounded by the sword. Therefore, to show the wicked in the final retribution, both internally to be filled, and externally surrounded by perpetual punishments, he assures that they will be tormented by the bitterness of wormwood, and slaughtered by the sword. And why the same sword is called two-edged, the Lord opens when he says: But fear him who can destroy both soul and body in hell (Matthew 10).”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.