www.Gracehead.com has some teaching MP3 files that are tremendous.
The collection is increased every so often, so check back for new additions.
HERE is the link:
http://www.gracehead.com/myrandomfiles/Teaching%20MP3/
A good set to start is the Bob George audio.
Even now do you possess the power of the Spirit. You only lack the faith to use what I have given you. Doubt is your enemy which also leaves the door open to the devil. He does continually hiss at you as a serpent, winding his way about your feet, waiting for the moment to strike you down when you waver. (The Lord Will Carry You - Letters from God and His Christ - Volume 6)