As I look ahead, I am filled with foreboding. Like the Roman, I seem to see "the River Tiber foaming with much blood."

Alluding to Virgil's report of the Sybil's prophesy, from the Aeneid, book 6, l. 86: "Et Thybrim multo spumantem sanguine cerno." This is one of the concluding lines that gave the speech its common title. - The 'Rivers of Blood' speech