i absolutely agree. heck, id even go as far as to say that ive had spirits working through me without my knowing it before i really started to draw close to Jesus. Particularly of anger, addiction, and to some degree lust.

Ephesians 6: 11-13 tells us...
11 Put on the whole armour of God, that ye may be able to stand against the wiles of the devil.

12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.

13 Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand.

And in my opinion, if you take your Bible seriously, this is both a warning (lest the enemy overtake us) and encouragement ( as God is true to his word, and Jesus is the word made flesh).

Honestly, there is a lot to be said on this topic, you know?

:-)