'Tis not ev'ry day that I <br />Fitted am to prophesy: <br />No, but when the spirit fills <br />The fantastic pannicles, <br />Full of fire, then I write <br />As the Godhead doth indite. <br />Thus enraged, my lines are hurl'd, <br />Like the Sibyl's, through the world: <br />Look how next the holy fire <br />Either slakes, or doth retire; <br />So the fancy cools:--till when <br />That brave spirit comes again.<br /><br />Robert Herrick<br /><br />http://www.poemhunter.com/poem/not-every-day-fit-for-verse/