Quote by N.T. Wright

To say such a thing ['This is the work of the devil.'] was to paint oneself into a corner from which there was no escape. Once define the battle for your liberation as the work of the enemy, and you will never be free.


(N.T. Wright, Jesus And The Victory Of God, 454)


Sources:


around the 1hr 37min mark
http://www.ancientfaith.com/podcasts/aftoday/making_sense_of_the_difficult_sayings_of_jesus

http://apolojet.wordpress.com/2012/04/06/blasphemy-against-the-holy-spirit-then-and-now/