The Devil is called a man that is an enemy because he has ceased to be God; and in the ninth Psalm it is written of him, “Up, Lord, and Let not man have the upper hand.” [Ps 9:19] Wherefore let not him sleep that is set over the Church, lest through his carelessness the enemy should sow therein tares, that is, the dogmas of the heretics.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).