The enemy does not have this kind of power...Yes demons exist but they only hang around you when you initiate those kind of thoughts...
You have the power, you are the key -- this is what is taught in this program...when you meditate upon the goodness of the Lord, blocking out all negativity from whatever source -- whether it be your soul, a person or, even, the devil---only the Presence of God is there to meet you... think about it...
This is why we feel so good after prayer or service because we have been in His presence thinking godly and good thoughts... Paul admonishes us to "think upon whatsoever is lovely, of good report, praise worthly, virtuous, etc. etc." (Phil. 4:8)
Once this dawns upon you, this understanding will unlock the door...

Paul speaks of "casting down imaginations and every high thing that exalts itself against the knowledge of God and bringing every thought into the captivity of Christ Jesus." IICor 10:4-5
The responsibility is upon each of us as individuals to caste down - pause, stop, block or replace- negative thoughts with thoughts that are positive, lovely, of good report, full of compassion, forgiveness, peaceful... This is what this program teaches us to do from lesson 1-15...
When I started the program... things were so bad that I just made a concrete decision to do what ever they teach in the program along with what the Holy Spirit would lead me to do -- everything based upon the Word (holy scriptures)... After hearing a part of lesson 3, that is given for free when speaks about stopping your own negativity, I was delivered and have been delivered ...
...fighting the air and just being angry at a being that I have no control over is pointless... I am not the devil's victim... he is mine!

Ladies and Gentlemen, I would encourage you not to concede your power to the devil... he is nothing and a nobody -- a defeated foe.... don't make him bigger than he is.... Please study who God is and who you are in Christ Jesus... this will be of great benefit to help you get a good picture of who you are dealing with...
Confession: "I own my mind.... I am an adult... I am fully responsible for the thoughts that I think... no outside entity has this power... "
For God has not given me a spirit of fear but of Love, of Power and of a Sound Mind -- II Tim 1:7