The Pange Lingua in this case refers to the Mediaeval Roman Catholic hymn by Thomas Aquinas, celebrating the Eucharist.
This is a biblical quotation, setting out God's punishment of Cain for killing his brother Abel:
And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand; When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth. And Cain said unto the LORD, My punishment is greater than I can bear. Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that findeth me shall slay me. And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.
Genesis 4: 11-15
In April 1803, Napoleon struck a deal with the United States to sell the colony of Louisiana for approximately $15 million. The French territory covered 829,000 square miles, stretching from New Orleans into Canada. The purchase, which included all or part of 14 states, doubled the size of the young nation.
More information about the Louisiana Purchase can be found here.
This is a quotation from Samuel Taylor Coleridge's epic poem "The Rime of the Ancient Mariner." It comes from Part III of the poem, and describes the appearance of a ghost-like ship.
Read "The Rime of the Ancient Mariner" in full here.
Or hear it read aloud here (the section Rice quotes can be found at about 9.34).