Respectfully Quoted: A Dictionary of Quotations. 1989.
John Milton (160874)
He that has light within his own cleer brest May sit ith center, and enjoy bright day, But he that hides a dark soul, and foul thoughts Benighted walks under the mid-day Sun; Himself is his own dungeon.
JOHN MILTON, A Mask Presented at Ludlow Castle, 1634, lines 38084, The Works of John Milton, vol. 1, part 1, p. 99 (1931). The title was changed to Comus for the stage version in 1737.