Abba Marcellus

"Believe me, children, there is nothing which troubles, incites, irritates, wounds, destroys, distresses, and excites the demons and the supremely evil Satan himself against us, as the constant study of the psalms. The entire holy Scripture is beneficial to us and not a little offensive to the demons, but none of it distresses them more than the psalter." Abba Marcellus, in John Moscus' THE SPIRITUAL MEADOW  http://www.amazon.com/Spiritual-Meadow-Pratum-Spirituale/dp/0879075392/ref=sr_1_1?ie=UTF8&s=books&qid=1295966448&sr=1-1