If we believe the Greek poet, "it is sometimes pleasant to be mad"; again, Plato always knocked in vain at the door of poetry when he was sober; or, if we trust Aristotle, no great genius has ever been without a touch of insanity. The mind cannot use lofty language, above that of the common herd, unless it be excited. When it has spurned aside the commonplace environments of custom, and rises sublime, instinct with sacred fire, then alone can it chant a song too grand for mortal lips: as long as it continues to dwell within itself it cannot rise to any pitch of splendour: it must break away from the beaten track, and lash itself to frenzy, till it gnaws the curb and rushes away bearing up its rider to heights whither it would fear to climb when alone.