The Divine Comedy: Purgatory

To run over better waters the little vessel of my genius now hoists its sails, and leaves behind itself a sea so cruel; and I will sing of that second realm where the human spirit is purified and becomes worthy to ascend to heaven.
But here let dead poesy rise again, O holy Muses, since yours I am, and here let Calliope somewhat mount up, accompanying my song with that sound of which the wretched Picae felt the stroke such that they despaired of pardon.