That clip is from a classic movie, The Usual Suspects, which happened to be my favorite movie throughout high school (I've probably seen it 30 times at least). However, I can't technically recommend it to you due to some unsavory use of the English language, but the clip above stands out as one of the more memorable moments of this Oscar winning film.
There are two equal and opposite errors into which our race can fall about the devils. One is to disbelieve in their existence. The other is to believe, and to feel an excessive and unhealthy interest in them. They themselves are equally pleased by both errors and hail a materialist or a magician with the same delight.
John asked a great question at the end of the sermon, "What do we do with the spiritual realm? If it is real, and it is, how then do we live?" The short answer is this: Be more impressed with Jesus than demons. James 4:7 says, "Submit yourselves therefore to God. Resist the devil, and he will flee from you." Submitting ourselves first and foremost to God and resisting the devil can look a lot ways, but one practical application is to simply praise the Lord. We can start by acknowledging His character, His unchanging nature, His sacrificial death on the cross, His triumphant resurrection, and His ascension into glory as King and Savior. Just typing that out causes praise, and thus, submission to happen in my heart. When we place our hope on Christ, and set our hearts on loving Him, most assuredly, there will be grace to persevere and resist.
In you, O LORD, do I take refuge;
let me never be put to shame;
in your righteousness deliver me!
Incline your ear to me;
rescue me speedily!
Be a rock of refuge for me,
a strong fortress to save me!
For you are my rock and my fortress;
and for your name's sake you lead me and guide me;
you take me out of the net they have hidden for me,
for you are my refuge.
Into your hand I commit my spirit;
you have redeemed me, O LORD, faithful God.