The allusion to the sibyl in the third line of the first stanza, "Teste David cum Sybilla," [1] has given rise to a good deal of anxious inquiry; and so very strange did it sound to French ears at its introduction into the sacred hymnology of the Church, that the Parisian rituals substituted in its place the line, _Crucis expandens vexilla_. The difficulty is, however, easily overcome if we bear in mind that many of the early Fathers held that Almighty God made use of these sibyls to promulgate His truths in just the same way as He did of Balaam of old, and many others like him. The great St. Augustine has written much on this subject in his "City of God;" and the reader may form some idea of the estimation in which these sibyls were held, when he is told that the world-renowned Michael Angelo made them the subject of one of his greatest paintings.... In the opinions of the ablest critics it was the Erythrean sibyl who uttered the celebrated prediction about the advent of our Divine Lord and His final coming at the last day to judge the living and the dead.... The part of the sibyl's response which referred particularly to the Day of Judgment was written (as an acrostic) on the letters of Soter, or Saviour. It is given as follows in the translation of the "City of God" of St. Augustine: [Footnote 1: As David and Sibyls say.] "Sounding, the archangel's trumpet shall peal down from heaven, Over the wicked who groan in their guilt and their manifold sorrows, Trembling, the earth shall be opened, revealing chaos and hell. Every king before God shall stand on that day to be judged; Rivers of fire and of brimstone shall fall from the heavens." DANTE'S "PURGATORIO." The bright sun was risen More than two hours aloft; and to the sea My looks were turned. "Fear not," my master cried. "Assured we are at happy point. Thy strength Shrink not, but rise dilated. Thou art come To Purgatory now. Lo! there the cliff That circling bounds it. Lo! the entrance there, Where it doth seem disparted."... Reader! thou markest how my theme doth rise; Nor wonder, therefore, if more artfully I prop the structure. Nearer now we drew, Arrived whence, in that part where first a breach As of a wall appeared. I could descry A portal, and three steps beneath, that led For inlet there, of different color each; And one who watched, but spake not yet a word, As more and more mine eye did stretch its view, I marked him seated on the highest step, In visage such as past my power to bear. Grasped in his hand, a naked sword glanced back The rays so towards me, that I oft in vain My sight directed. "Speak from whence ye stand," He cried; "What would ye? Where is your escort? Take heed your coming upward harm ye not."