From the early Church Fathers to now.
“And when thou shalt have made an end of reading this book, thou shalt tie a stone to it, and shalt throw it into the midst of the Euphrates:”
“bind a stone, &c.-- (Rev 18:21). So the Phoceans in leaving their country, when about to found Marseilles, threw lead into the sea, binding themselves not to return till the lead should swim.”
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.